catalog loading performance and cache improvement

app/build.gradle.kts

@@ -63,9 +63,10 @@ android {
     buildTypes {
         debug {
             signingConfig = signingConfigs.getByName("release")
-            isDebuggable = false
+            isDebuggable = true
             isMinifyEnabled = false
 
+            resValue("string", "app_name", "Nuvio Debug")
             buildConfigField("boolean", "IS_DEBUG_BUILD", "true")
 
             // Dev environment (from local.dev.properties)
@@ -86,6 +87,7 @@ android {
             )
             signingConfig = signingConfigs.getByName("release")
 
+            resValue("string", "app_name", "Nuvio")
             buildConfigField("boolean", "IS_DEBUG_BUILD", "false")
 
             // Production environment (from local.properties)
@@ -124,6 +126,12 @@ android {
     }
 }
 
+androidComponents {
+    onVariants(selector().withBuildType("debug")) { variant ->
+        variant.applicationId.set("com.nuviodebug.tv")
+    }
+}
+
 composeCompiler {
     // Enable Compose compiler metrics for performance analysis
     metricsDestination = layout.buildDirectory.dir("compose_metrics")
@@ -140,7 +148,7 @@ configurations.all {
 dependencies {
     val composeBom = platform("androidx.compose:compose-bom:2026.01.01")
 
-    // baselineProfile(project(":benchmark"))  // TODO: create benchmark module later
+    baselineProfile(project(":benchmark"))
     implementation(libs.androidx.core.ktx)
     implementation("androidx.core:core-splashscreen:1.0.1")
     implementation(libs.androidx.appcompat)

app/src/main/AndroidManifest.xml

@@ -19,7 +19,7 @@
         android:allowBackup="true"
         android:banner="@mipmap/banner"
         android:icon="@mipmap/ic_launcher"
-        android:label="Nuvio"
+        android:label="@string/app_name"
         android:largeHeap="true"
         android:usesCleartextTraffic="true"
         android:supportsRtl="true"

app/src/main/java/com/nuvio/tv/MainActivity.kt

@@ -116,12 +116,14 @@ import com.nuvio.tv.ui.screens.account.AuthQrSignInScreen
 import com.nuvio.tv.ui.screens.profile.ProfileSelectionScreen
 import com.nuvio.tv.ui.theme.NuvioColors
 import com.nuvio.tv.ui.theme.NuvioTheme
+import com.nuvio.tv.updater.UpdateUiState
 import com.nuvio.tv.updater.UpdateViewModel
 import com.nuvio.tv.updater.ui.UpdatePromptDialog
 import dagger.hilt.android.AndroidEntryPoint
 import dev.chrisbanes.haze.HazeState
 import dev.chrisbanes.haze.haze
 import javax.inject.Inject
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.map
@@ -175,6 +177,8 @@ class MainActivity : ComponentActivity() {
     lateinit var appOnboardingDataStore: AppOnboardingDataStore
 
     private lateinit var jankStats: JankStats
+    private var startupSyncJob: Job? = null
+    private var hasDispatchedStartupSync: Boolean = false
 
     @OptIn(ExperimentalTvMaterial3Api::class, ExperimentalFoundationApi::class)
     override fun attachBaseContext(newBase: Context) {
@@ -330,8 +334,17 @@ class MainActivity : ComponentActivity() {
                         mainUiPrefs.modernSidebarBlurPref && android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S
                     val hideBuiltInHeadersForFloatingPill = modernSidebarEnabled && !sidebarCollapsed
 
-                    val updateViewModel: UpdateViewModel = hiltViewModel(this@MainActivity)
-                    val updateState by updateViewModel.uiState.collectAsState()
+                    var shouldInitUpdateViewModel by remember { mutableStateOf(false) }
+                    LaunchedEffect(Unit) {
+                        delay(4000)
+                        shouldInitUpdateViewModel = true
+                    }
+                    val updateViewModel: UpdateViewModel? = if (shouldInitUpdateViewModel) {
+                        hiltViewModel(this@MainActivity)
+                    } else {
+                        null
+                    }
+                    val updateState = updateViewModel?.uiState?.collectAsState()?.value ?: UpdateUiState()
 
                     val startDestination = if (layoutChosen) Screen.Home.route else Screen.LayoutSelection.route
                     val navController = rememberNavController()
@@ -443,11 +456,11 @@ class MainActivity : ComponentActivity() {
 
                     UpdatePromptDialog(
                         state = updateState,
-                        onDismiss = { updateViewModel.dismissDialog() },
-                        onDownload = { updateViewModel.downloadUpdate() },
-                        onInstall = { updateViewModel.installUpdateOrRequestPermission() },
-                        onIgnore = { updateViewModel.ignoreThisVersion() },
-                        onOpenUnknownSources = { updateViewModel.openUnknownSourcesSettings() }
+                        onDismiss = { updateViewModel?.dismissDialog() },
+                        onDownload = { updateViewModel?.downloadUpdate() },
+                        onInstall = { updateViewModel?.installUpdateOrRequestPermission() },
+                        onIgnore = { updateViewModel?.ignoreThisVersion() },
+                        onOpenUnknownSources = { updateViewModel?.openUnknownSourcesSettings() }
                     )
                 }
             }
@@ -476,9 +489,22 @@ class MainActivity : ComponentActivity() {
 
     override fun onStart() {
         super.onStart()
-        startupSyncService.requestSyncNow()
-        lifecycleScope.launch {
+        if (hasDispatchedStartupSync || startupSyncJob?.isActive == true) {
+            return
+        }
+        startupSyncJob = lifecycleScope.launch {
+            delay(3200)
+            startupSyncService.requestSyncNow()
+            delay(1200)
             traktProgressService.refreshNow()
+            hasDispatchedStartupSync = true
+        }
+    }
+
+    override fun onStop() {
+        super.onStop()
+        if (!hasDispatchedStartupSync && startupSyncJob?.isActive == true) {
+            startupSyncJob?.cancel()
         }
     }
 }

app/src/main/java/com/nuvio/tv/NuvioApplication.kt

@@ -1,42 +1,68 @@
 package com.nuvio.tv
 
 import android.app.Application
+import android.content.ComponentCallbacks2
+import android.content.res.Configuration
 import coil.ImageLoader
 import coil.ImageLoaderFactory
 import coil.disk.DiskCache
 import coil.memory.MemoryCache
+import com.nuvio.tv.core.device.DeviceCapabilities
 import com.nuvio.tv.core.sync.StartupSyncService
 import dagger.hilt.android.HiltAndroidApp
 import kotlinx.coroutines.Dispatchers
 import javax.inject.Inject
 
 @HiltAndroidApp
-class NuvioApplication : Application(), ImageLoaderFactory {
+class NuvioApplication : Application(), ImageLoaderFactory, ComponentCallbacks2 {
 
     @Inject lateinit var startupSyncService: StartupSyncService
+    @Inject lateinit var deviceCapabilities: DeviceCapabilities
+
+    private var _imageLoader: ImageLoader? = null
 
     override fun onCreate() {
         super.onCreate()
     }
 
     override fun newImageLoader(): ImageLoader {
-        return ImageLoader.Builder(this)
+        val caps = deviceCapabilities
+        val loader = ImageLoader.Builder(this)
             .memoryCache {
                 MemoryCache.Builder(this)
-                    .maxSizePercent(0.25)
+                    .maxSizePercent(caps.memoryCachePercent)
                     .build()
             }
             .diskCache {
                 DiskCache.Builder()
                     .directory(cacheDir.resolve("image_cache"))
-                    .maxSizeBytes(200L * 1024 * 1024)
+                    .maxSizeBytes(caps.diskCacheSizeBytes)
                     .build()
             }
-            .decoderDispatcher(Dispatchers.IO.limitedParallelism(2))
-            .fetcherDispatcher(Dispatchers.IO.limitedParallelism(4))
-            .bitmapFactoryMaxParallelism(2)
+            .decoderDispatcher(Dispatchers.IO.limitedParallelism(caps.decoderParallelism))
+            .fetcherDispatcher(Dispatchers.IO.limitedParallelism(caps.fetcherParallelism))
+            .bitmapFactoryMaxParallelism(caps.decoderParallelism)
             .allowRgb565(true)
             .crossfade(false)
             .build()
+        _imageLoader = loader
+        return loader
+    }
+
+    @Suppress("DEPRECATION")
+    override fun onTrimMemory(level: Int) {
+        super.onTrimMemory(level)
+        if (level >= ComponentCallbacks2.TRIM_MEMORY_RUNNING_LOW) {
+            _imageLoader?.memoryCache?.clear()
+        }
+    }
+
+    override fun onLowMemory() {
+        super.onLowMemory()
+        _imageLoader?.memoryCache?.clear()
+    }
+
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
     }
 }

app/src/main/java/com/nuvio/tv/core/device/DeviceCapabilities.kt

@@ -0,0 +1,140 @@
+package com.nuvio.tv.core.device
+
+import android.app.ActivityManager
+import android.content.Context
+import android.util.Log
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import javax.inject.Inject
+import javax.inject.Singleton
+
+enum class DeviceTier { LOW, MEDIUM, HIGH }
+
+@Singleton
+class DeviceCapabilities @Inject constructor(
+    @ApplicationContext private val context: Context
+) {
+    companion object {
+        private const val TAG = "DeviceCapabilities"
+        private const val LOW_HEAP_THRESHOLD_MB = 256
+        private const val HIGH_HEAP_THRESHOLD_MB = 384
+    }
+
+    private val _tierOverride = MutableStateFlow<DeviceTier?>(null)
+    val tierOverride: StateFlow<DeviceTier?> = _tierOverride.asStateFlow()
+
+    private val detectedTier: DeviceTier = detectTier()
+
+    val tier: DeviceTier
+        get() = _tierOverride.value ?: detectedTier
+
+    fun setTierOverride(override: DeviceTier?) {
+        val previous = _tierOverride.value
+        _tierOverride.value = override
+        val effective = override ?: detectedTier
+        Log.i(TAG, "Tier override changed: ${previous ?: "auto"} -> ${override ?: "auto"} (effective=$effective, detected=$detectedTier)" +
+            " | poster=${tmdbPosterSize}, backdrop=${tmdbBackdropSize}, decoders=$decoderParallelism, fetchers=$fetcherParallelism" +
+            " | memCache=${(memoryCachePercent * 100).toInt()}%, diskCache=${diskCacheSizeBytes / 1024 / 1024}MB" +
+            " | keyThrottle=${keyRepeatThrottleMs}ms, prefetch=$nestedPrefetchItemCount")
+    }
+
+    // -- Coil image loader config --
+
+    val memoryCachePercent: Double
+        get() = when (tier) {
+            DeviceTier.LOW -> 0.15
+            DeviceTier.MEDIUM -> 0.20
+            DeviceTier.HIGH -> 0.25
+        }
+
+    val diskCacheSizeBytes: Long
+        get() = when (tier) {
+            DeviceTier.LOW -> 75L * 1024 * 1024
+            DeviceTier.MEDIUM -> 150L * 1024 * 1024
+            DeviceTier.HIGH -> 200L * 1024 * 1024
+        }
+
+    val decoderParallelism: Int
+        get() = when (tier) {
+            DeviceTier.LOW -> 1
+            DeviceTier.MEDIUM -> 2
+            DeviceTier.HIGH -> 2
+        }
+
+    val fetcherParallelism: Int
+        get() = when (tier) {
+            DeviceTier.LOW -> 2
+            DeviceTier.MEDIUM -> 3
+            DeviceTier.HIGH -> 4
+        }
+
+    // -- TMDB image sizes --
+
+    val tmdbPosterSize: String
+        get() = when (tier) {
+            DeviceTier.LOW -> "w185"
+            DeviceTier.MEDIUM -> "w342"
+            DeviceTier.HIGH -> "w500"
+        }
+
+    val tmdbBackdropSize: String
+        get() = when (tier) {
+            DeviceTier.LOW -> "w780"
+            DeviceTier.MEDIUM -> "w780"
+            DeviceTier.HIGH -> "w1280"
+        }
+
+    val tmdbProfileSize: String
+        get() = when (tier) {
+            DeviceTier.LOW -> "w185"
+            DeviceTier.MEDIUM -> "w342"
+            DeviceTier.HIGH -> "w500"
+        }
+
+    val tmdbLogoSize: String
+        get() = when (tier) {
+            DeviceTier.LOW -> "w185"
+            DeviceTier.MEDIUM -> "w300"
+            DeviceTier.HIGH -> "w500"
+        }
+
+    val tmdbStillSize: String
+        get() = when (tier) {
+            DeviceTier.LOW -> "w300"
+            DeviceTier.MEDIUM -> "w300"
+            DeviceTier.HIGH -> "w500"
+        }
+
+    // -- UI performance --
+
+    val keyRepeatThrottleMs: Long
+        get() = when (tier) {
+            DeviceTier.LOW -> 140L
+            DeviceTier.MEDIUM -> 80L
+            DeviceTier.HIGH -> 80L
+        }
+
+    val nestedPrefetchItemCount: Int
+        get() = when (tier) {
+            DeviceTier.LOW -> 0
+            DeviceTier.MEDIUM -> 2
+            DeviceTier.HIGH -> 2
+        }
+
+    private fun detectTier(): DeviceTier {
+        val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+        val isLowRam = activityManager.isLowRamDevice
+        val maxHeapMb = (Runtime.getRuntime().maxMemory() / (1024 * 1024)).toInt()
+
+        val tier = when {
+            isLowRam || maxHeapMb < LOW_HEAP_THRESHOLD_MB -> DeviceTier.LOW
+            maxHeapMb < HIGH_HEAP_THRESHOLD_MB -> DeviceTier.MEDIUM
+            else -> DeviceTier.HIGH
+        }
+
+        Log.i(TAG, "Device tier: $tier (lowRam=$isLowRam, maxHeap=${maxHeapMb}MB)")
+        return tier
+    }
+}

app/src/main/java/com/nuvio/tv/core/image/TmdbImageUrlOptimizer.kt

@@ -0,0 +1,33 @@
+package com.nuvio.tv.core.image
+
+import com.nuvio.tv.core.device.DeviceCapabilities
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class TmdbImageUrlOptimizer @Inject constructor(
+    private val deviceCapabilities: DeviceCapabilities
+) {
+    companion object {
+        private val TMDB_IMAGE_URL_REGEX =
+            Regex("""https?://image\.tmdb\.org/t/p/(w\d+|original)(/[^?#\s]+)""")
+    }
+
+    fun optimizePosterUrl(url: String?): String? {
+        url ?: return null
+        return replaceSize(url, deviceCapabilities.tmdbPosterSize)
+    }
+
+    fun optimizeBackdropUrl(url: String?): String? {
+        url ?: return null
+        return replaceSize(url, deviceCapabilities.tmdbBackdropSize)
+    }
+
+    private fun replaceSize(url: String, targetSize: String): String {
+        val match = TMDB_IMAGE_URL_REGEX.find(url) ?: return url
+        val currentSize = match.groupValues[1]
+        if (currentSize == targetSize) return url
+        val path = match.groupValues[2]
+        return "https://image.tmdb.org/t/p/$targetSize$path"
+    }
+}

app/src/main/java/com/nuvio/tv/core/tmdb/TmdbMetadataService.kt

@@ -7,6 +7,7 @@ import com.nuvio.tv.data.remote.api.TmdbImage
 import com.nuvio.tv.data.remote.api.TmdbPersonCreditCast
 import com.nuvio.tv.data.remote.api.TmdbPersonCreditCrew
 import com.nuvio.tv.data.remote.api.TmdbRecommendationResult
+import com.nuvio.tv.core.device.DeviceCapabilities
 import com.nuvio.tv.domain.model.ContentType
 import com.nuvio.tv.domain.model.MetaCastMember
 import com.nuvio.tv.domain.model.MetaCompany
@@ -28,7 +29,8 @@ private const val TMDB_API_KEY = "439c478a771f35c05022f9feabcca01c"
 
 @Singleton
 class TmdbMetadataService @Inject constructor(
-    private val tmdbApi: TmdbApi
+    private val tmdbApi: TmdbApi,
+    private val deviceCapabilities: DeviceCapabilities
 ) {
     // In-memory caches
     private val enrichmentCache = ConcurrentHashMap<String, TmdbEnrichment>()
@@ -120,7 +122,7 @@ class TmdbMetadataService @Inject constructor(
                         val name = company.name?.trim()?.takeIf { it.isNotBlank() } ?: return@mapNotNull null
                         MetaCompany(
                             name = name,
-                            logo = buildImageUrl(company.logoPath, size = "w300")
+                            logo = buildLogoUrl(company.logoPath)
                         )
                     }
                 val networks = details?.networks
@@ -129,11 +131,11 @@ class TmdbMetadataService @Inject constructor(
                         val name = network.name?.trim()?.takeIf { it.isNotBlank() } ?: return@mapNotNull null
                         MetaCompany(
                             name = name,
-                            logo = buildImageUrl(network.logoPath, size = "w300")
+                            logo = buildLogoUrl(network.logoPath)
                         )
                     }
-                val poster = buildImageUrl(details?.posterPath, size = "w500")
-                val backdrop = buildImageUrl(details?.backdropPath, size = "w1280")
+                val poster = buildPosterUrl(details?.posterPath)
+                val backdrop = buildBackdropUrl(details?.backdropPath)
 
                 val logoPath = images?.logos
                     ?.sortedWith(
@@ -146,7 +148,7 @@ class TmdbMetadataService @Inject constructor(
                     ?.firstOrNull()
                     ?.filePath
 
-                val logo = buildImageUrl(logoPath, size = "w500")
+                val logo = buildLogoUrl(logoPath)
 
                 val castMembers = credits?.cast
                     .orEmpty()
@@ -155,7 +157,7 @@ class TmdbMetadataService @Inject constructor(
                         MetaCastMember(
                             name = name,
                             character = member.character?.takeIf { it.isNotBlank() },
-                            photo = buildImageUrl(member.profilePath, size = "w500"),
+                            photo = buildProfileUrl(member.profilePath),
                             tmdbId = member.id
                         )
                     }
@@ -169,7 +171,7 @@ class TmdbMetadataService @Inject constructor(
                             MetaCastMember(
                                 name = name,
                                 character = "Creator",
-                                photo = buildImageUrl(creator.profilePath, size = "w500"),
+                                photo = buildProfileUrl(creator.profilePath),
                                 tmdbId = tmdbPersonId
                             )
                         }
@@ -197,7 +199,7 @@ class TmdbMetadataService @Inject constructor(
                         MetaCastMember(
                             name = name,
                             character = "Director",
-                            photo = buildImageUrl(member.profilePath, size = "w500"),
+                            photo = buildProfileUrl(member.profilePath),
                             tmdbId = tmdbPersonId
                         )
                     }
@@ -220,7 +222,7 @@ class TmdbMetadataService @Inject constructor(
                         MetaCastMember(
                             name = name,
                             character = "Writer",
-                            photo = buildImageUrl(member.profilePath, size = "w500"),
+                            photo = buildProfileUrl(member.profilePath),
                             tmdbId = tmdbPersonId
                         )
                     }
@@ -404,8 +406,8 @@ class TmdbMetadataService @Inject constructor(
                             )
                         }
 
-                        val backdrop = buildImageUrl(localizedBackdropPath ?: rec.backdropPath, size = "w1280")
-                        val fallbackPoster = buildImageUrl(rec.posterPath, size = "w780")
+                        val backdrop = buildBackdropUrl(localizedBackdropPath ?: rec.backdropPath)
+                        val fallbackPoster = buildBackdropUrl(rec.posterPath)
                         val releaseInfo = (rec.releaseDate ?: rec.firstAirDate)?.take(4)
 
                         MetaPreview(
@@ -433,6 +435,21 @@ class TmdbMetadataService @Inject constructor(
         }
     }
 
+    private fun buildPosterUrl(path: String?): String? =
+        buildImageUrl(path, deviceCapabilities.tmdbPosterSize)
+
+    private fun buildBackdropUrl(path: String?): String? =
+        buildImageUrl(path, deviceCapabilities.tmdbBackdropSize)
+
+    private fun buildProfileUrl(path: String?): String? =
+        buildImageUrl(path, deviceCapabilities.tmdbProfileSize)
+
+    private fun buildLogoUrl(path: String?): String? =
+        buildImageUrl(path, deviceCapabilities.tmdbLogoSize)
+
+    private fun buildStillUrl(path: String?): String? =
+        buildImageUrl(path, deviceCapabilities.tmdbStillSize)
+
     private fun buildImageUrl(path: String?, size: String): String? {
         val clean = path?.trim()?.takeIf { it.isNotBlank() } ?: return null
         return "https://image.tmdb.org/t/p/$size$clean"
@@ -509,7 +526,7 @@ class TmdbMetadataService @Inject constructor(
                     birthday = person.birthday?.takeIf { it.isNotBlank() },
                     deathday = person.deathday?.takeIf { it.isNotBlank() },
                     placeOfBirth = person.placeOfBirth?.takeIf { it.isNotBlank() },
-                    profilePhoto = buildImageUrl(person.profilePath, "w500"),
+                    profilePhoto = buildProfileUrl(person.profilePath),
                     knownFor = person.knownForDepartment?.takeIf { it.isNotBlank() },
                     movieCredits = movieCredits,
                     tvCredits = tvCredits
@@ -541,9 +558,9 @@ class TmdbMetadataService @Inject constructor(
                     id = "tmdb:${credit.id}",
                     type = ContentType.MOVIE,
                     name = title,
-                    poster = buildImageUrl(credit.posterPath, "w500"),
+                    poster = buildPosterUrl(credit.posterPath),
                     posterShape = PosterShape.POSTER,
-                    background = buildImageUrl(credit.backdropPath, "w1280"),
+                    background = buildBackdropUrl(credit.backdropPath),
                     logo = null,
                     description = credit.overview?.takeIf { it.isNotBlank() },
                     releaseInfo = year,
@@ -566,9 +583,9 @@ class TmdbMetadataService @Inject constructor(
                     id = "tmdb:${credit.id}",
                     type = ContentType.MOVIE,
                     name = title,
-                    poster = buildImageUrl(credit.posterPath, "w500"),
+                    poster = buildPosterUrl(credit.posterPath),
                     posterShape = PosterShape.POSTER,
-                    background = buildImageUrl(credit.backdropPath, "w1280"),
+                    background = buildBackdropUrl(credit.backdropPath),
                     logo = null,
                     description = credit.overview?.takeIf { it.isNotBlank() },
                     releaseInfo = year,
@@ -591,9 +608,9 @@ class TmdbMetadataService @Inject constructor(
                     id = "tmdb:${credit.id}",
                     type = ContentType.SERIES,
                     name = title,
-                    poster = buildImageUrl(credit.posterPath, "w500"),
+                    poster = buildPosterUrl(credit.posterPath),
                     posterShape = PosterShape.POSTER,
-                    background = buildImageUrl(credit.backdropPath, "w1280"),
+                    background = buildBackdropUrl(credit.backdropPath),
                     logo = null,
                     description = credit.overview?.takeIf { it.isNotBlank() },
                     releaseInfo = year,
@@ -616,9 +633,9 @@ class TmdbMetadataService @Inject constructor(
                     id = "tmdb:${credit.id}",
                     type = ContentType.SERIES,
                     name = title,
-                    poster = buildImageUrl(credit.posterPath, "w500"),
+                    poster = buildPosterUrl(credit.posterPath),
                     posterShape = PosterShape.POSTER,
-                    background = buildImageUrl(credit.backdropPath, "w1280"),
+                    background = buildBackdropUrl(credit.backdropPath),
                     logo = null,
                     description = credit.overview?.takeIf { it.isNotBlank() },
                     releaseInfo = year,
@@ -714,7 +731,7 @@ data class TmdbEpisodeEnrichment(
 private fun TmdbEpisode.toEnrichment(): TmdbEpisodeEnrichment {
     val title = name?.takeIf { it.isNotBlank() }
     val overview = overview?.takeIf { it.isNotBlank() }
-    val thumbnail = stillPath?.takeIf { it.isNotBlank() }?.let { "https://image.tmdb.org/t/p/w500$it" }
+    val thumbnail = stillPath?.takeIf { it.isNotBlank() }?.let { "https://image.tmdb.org/t/p/w300$it" }
     val airDate = airDate?.takeIf { it.isNotBlank() }
     return TmdbEpisodeEnrichment(
         title = title,

app/src/main/java/com/nuvio/tv/data/local/DebugSettingsDataStore.kt

@@ -5,6 +5,7 @@ import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
 import androidx.datastore.preferences.core.booleanPreferencesKey
 import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.flow.Flow
@@ -22,6 +23,7 @@ class DebugSettingsDataStore @Inject constructor(
 
     private val accountTabEnabledKey = booleanPreferencesKey("account_tab_enabled")
     private val syncCodeFeaturesEnabledKey = booleanPreferencesKey("sync_code_features_enabled")
+    private val deviceTierOverrideKey = stringPreferencesKey("device_tier_override")
 
     val accountTabEnabled: Flow<Boolean> = dataStore.data.map { prefs ->
         prefs[accountTabEnabledKey] ?: false
@@ -31,6 +33,10 @@ class DebugSettingsDataStore @Inject constructor(
         prefs[syncCodeFeaturesEnabledKey] ?: false
     }
 
+    val deviceTierOverride: Flow<String> = dataStore.data.map { prefs ->
+        prefs[deviceTierOverrideKey] ?: "auto"
+    }
+
     suspend fun setAccountTabEnabled(enabled: Boolean) {
         dataStore.edit { prefs ->
             prefs[accountTabEnabledKey] = enabled
@@ -42,4 +48,10 @@ class DebugSettingsDataStore @Inject constructor(
             prefs[syncCodeFeaturesEnabledKey] = enabled
         }
     }
+
+    suspend fun setDeviceTierOverride(value: String) {
+        dataStore.edit { prefs ->
+            prefs[deviceTierOverrideKey] = value
+        }
+    }
 }

app/src/main/java/com/nuvio/tv/data/repository/CatalogRepositoryImpl.kt

@@ -1,29 +1,84 @@
 package com.nuvio.tv.data.repository
 
 import android.util.Log
+import com.nuvio.tv.core.image.TmdbImageUrlOptimizer
 import com.nuvio.tv.core.network.NetworkResult
-import com.nuvio.tv.core.network.safeApiCall
 import com.nuvio.tv.data.mapper.toDomain
 import com.nuvio.tv.data.remote.api.AddonApi
 import com.nuvio.tv.domain.model.CatalogRow
 import com.nuvio.tv.domain.model.ContentType
 import com.nuvio.tv.domain.repository.CatalogRepository
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.flowOn
 import java.net.URLEncoder
-import java.util.concurrent.ConcurrentHashMap
+import kotlin.math.max
 import javax.inject.Inject
 import javax.inject.Singleton
 
 @Singleton
 class CatalogRepositoryImpl @Inject constructor(
-    private val api: AddonApi
+    private val api: AddonApi,
+    private val tmdbImageUrlOptimizer: TmdbImageUrlOptimizer
 ) : CatalogRepository {
     companion object {
         private const val TAG = "CatalogRepository"
+        private const val MAX_CACHE_ENTRIES = 256
+
+        // Fallbacks when addon responses don't provide Cache-Control directives.
+        private const val DEFAULT_MAX_AGE_SECONDS = 120L
+        private const val DEFAULT_STALE_REVALIDATE_SECONDS = 300L
+        private const val DEFAULT_STALE_IF_ERROR_SECONDS = 900L
+
+        private const val MAX_MAX_AGE_SECONDS = 24 * 60 * 60L
+        private const val MAX_STALE_WINDOW_SECONDS = 24 * 60 * 60L
     }
 
-    private val catalogCache = ConcurrentHashMap<String, CatalogRow>()
+    private data class CachePolicy(
+        val maxAgeMs: Long,
+        val staleRevalidateMs: Long,
+        val staleIfErrorMs: Long,
+        val cacheable: Boolean
+    ) {
+        val immediateServeWindowMs: Long
+            get() = maxAgeMs + staleRevalidateMs
+
+        val errorServeWindowMs: Long
+            get() = maxAgeMs + staleIfErrorMs
+
+        val hardExpiryWindowMs: Long
+            get() = max(immediateServeWindowMs, errorServeWindowMs)
+    }
+
+    private data class CachedCatalogEntry(
+        val row: CatalogRow,
+        val fetchedAtMs: Long,
+        val policy: CachePolicy
+    )
+
+    private sealed interface CatalogFetchResult {
+        data class Success(val row: CatalogRow) : CatalogFetchResult
+
+        data class Error(
+            val message: String,
+            val code: Int? = null
+        ) : CatalogFetchResult
+    }
+
+    private val cacheLock = Any()
+    private val catalogCache =
+        object : LinkedHashMap<String, CachedCatalogEntry>(MAX_CACHE_ENTRIES, 0.75f, true) {
+            override fun removeEldestEntry(eldest: MutableMap.MutableEntry<String, CachedCatalogEntry>?): Boolean {
+                return size > MAX_CACHE_ENTRIES
+            }
+        }
+    private val inFlightMutex = Mutex()
+    private val inFlightRequests = mutableMapOf<String, Deferred<CatalogFetchResult>>()
 
     override fun getCatalog(
         addonBaseUrl: String,
@@ -44,60 +99,271 @@ class CatalogRepositoryImpl @Inject constructor(
             skip = skip,
             extraArgs = extraArgs
         )
+        val now = System.currentTimeMillis()
+        val cachedEntry = getCachedEntry(cacheKey, now)
 
-        // Emit cached data immediately if available
-        val cached = catalogCache[cacheKey]
-        if (cached != null) {
-            emit(NetworkResult.Success(cached))
+        // Serve cache immediately when fresh or within stale-while-revalidate.
+        val serveCachedImmediately = cachedEntry != null &&
+            now - cachedEntry.fetchedAtMs <= cachedEntry.policy.immediateServeWindowMs
+
+        if (serveCachedImmediately) {
+            emit(NetworkResult.Success(cachedEntry.row))
         } else {
             emit(NetworkResult.Loading)
         }
 
+        // Fresh cache: no network call needed.
+        if (cachedEntry != null && now - cachedEntry.fetchedAtMs <= cachedEntry.policy.maxAgeMs) {
+            return@flow
+        }
+
         val url = buildCatalogUrl(addonBaseUrl, type, catalogId, skip, extraArgs)
         Log.d(
             TAG,
             "Fetching catalog addonId=$addonId addonName=$addonName type=$type catalogId=$catalogId skip=$skip supportsSkip=$supportsSkip url=$url"
         )
+        val result = fetchCatalogShared(
+            cacheKey = cacheKey,
+            url = url,
+            addonId = addonId,
+            addonName = addonName,
+            addonBaseUrl = addonBaseUrl,
+            catalogId = catalogId,
+            catalogName = catalogName,
+            type = type,
+            skip = skip,
+            supportsSkip = supportsSkip
+        )
 
-        when (val result = safeApiCall { api.getCatalog(url) }) {
-            is NetworkResult.Success -> {
-                val items = result.data.metas.map { it.toDomain() }
-                Log.d(
-                    TAG,
-                    "Catalog fetch success addonId=$addonId type=$type catalogId=$catalogId items=${items.size}"
-                )
-
-                val catalogRow = CatalogRow(
-                    addonId = addonId,
-                    addonName = addonName,
-                    addonBaseUrl = addonBaseUrl,
-                    catalogId = catalogId,
-                    catalogName = catalogName,
-                    type = ContentType.fromString(type),
-                    rawType = type,
-                    items = items,
-                    isLoading = false,
-                    hasMore = supportsSkip && items.isNotEmpty(),
-                    currentPage = skip / 100,
-                    supportsSkip = supportsSkip
-                )
-                catalogCache[cacheKey] = catalogRow
-                // Only emit fresh data if it differs from cache
-                if (cached == null || cached.items != catalogRow.items) {
-                    emit(NetworkResult.Success(catalogRow))
+        when (result) {
+            is CatalogFetchResult.Success -> {
+                // Only emit fresh data if it differs from what is currently displayed.
+                if (cachedEntry == null || cachedEntry.row.items != result.row.items) {
+                    emit(NetworkResult.Success(result.row))
                 }
             }
-            is NetworkResult.Error -> {
-                Log.w(
-                    TAG,
-                    "Catalog fetch failed addonId=$addonId type=$type catalogId=$catalogId code=${result.code} message=${result.message} url=$url"
-                )
-                // Only emit error if we had no cached data
-                if (cached == null) {
-                    emit(result)
+            is CatalogFetchResult.Error -> {
+                val canServeStaleOnError = cachedEntry != null &&
+                    now - cachedEntry.fetchedAtMs <= cachedEntry.policy.errorServeWindowMs
+
+                if (canServeStaleOnError) {
+                    // Keep stale content on-screen when network fails.
+                    if (!serveCachedImmediately) {
+                        emit(NetworkResult.Success(cachedEntry.row))
+                    }
+                } else {
+                    Log.w(
+                        TAG,
+                        "Catalog fetch failed addonId=$addonId type=$type catalogId=$catalogId code=${result.code} message=${result.message} url=$url"
+                    )
+                    emit(NetworkResult.Error(result.message, result.code))
                 }
             }
-            NetworkResult.Loading -> { /* Already emitted */ }
+        }
+    }.flowOn(Dispatchers.IO)
+
+    private suspend fun fetchCatalogShared(
+        cacheKey: String,
+        url: String,
+        addonId: String,
+        addonName: String,
+        addonBaseUrl: String,
+        catalogId: String,
+        catalogName: String,
+        type: String,
+        skip: Int,
+        supportsSkip: Boolean
+    ): CatalogFetchResult {
+        val existing = inFlightMutex.withLock { inFlightRequests[cacheKey] }
+        if (existing != null) {
+            return existing.await()
+        }
+
+        val deferred = CompletableDeferred<CatalogFetchResult>()
+        val winner = inFlightMutex.withLock {
+            val current = inFlightRequests[cacheKey]
+            if (current != null) {
+                current
+            } else {
+                inFlightRequests[cacheKey] = deferred
+                deferred
+            }
+        }
+
+        if (winner !== deferred) {
+            return winner.await()
+        }
+
+        try {
+            val result = fetchCatalogFromNetwork(
+                cacheKey = cacheKey,
+                url = url,
+                addonId = addonId,
+                addonName = addonName,
+                addonBaseUrl = addonBaseUrl,
+                catalogId = catalogId,
+                catalogName = catalogName,
+                type = type,
+                skip = skip,
+                supportsSkip = supportsSkip
+            )
+            deferred.complete(result)
+            return result
+        } catch (e: Exception) {
+            val error = CatalogFetchResult.Error(e.message ?: "Unknown error occurred")
+            deferred.complete(error)
+            return error
+        } finally {
+            inFlightMutex.withLock {
+                if (inFlightRequests[cacheKey] === deferred) {
+                    inFlightRequests.remove(cacheKey)
+                }
+            }
+        }
+    }
+
+    private suspend fun fetchCatalogFromNetwork(
+        cacheKey: String,
+        url: String,
+        addonId: String,
+        addonName: String,
+        addonBaseUrl: String,
+        catalogId: String,
+        catalogName: String,
+        type: String,
+        skip: Int,
+        supportsSkip: Boolean
+    ): CatalogFetchResult {
+        val response = try {
+            api.getCatalog(url)
+        } catch (e: Exception) {
+            return CatalogFetchResult.Error(e.message ?: "Unknown error occurred")
+        }
+
+        if (!response.isSuccessful) {
+            return CatalogFetchResult.Error(
+                message = response.message(),
+                code = response.code()
+            )
+        }
+
+        val body = response.body()
+            ?: return CatalogFetchResult.Error("Empty response body")
+
+        val items = body.metas.map { dto ->
+            val domain = dto.toDomain()
+            domain.copy(
+                poster = tmdbImageUrlOptimizer.optimizePosterUrl(domain.poster) ?: domain.poster,
+                background = tmdbImageUrlOptimizer.optimizeBackdropUrl(domain.background) ?: domain.background
+            )
+        }
+        Log.d(
+            TAG,
+            "Catalog fetch success addonId=$addonId type=$type catalogId=$catalogId items=${items.size}"
+        )
+
+        val catalogRow = CatalogRow(
+            addonId = addonId,
+            addonName = addonName,
+            addonBaseUrl = addonBaseUrl,
+            catalogId = catalogId,
+            catalogName = catalogName,
+            type = ContentType.fromString(type),
+            rawType = type,
+            items = items,
+            isLoading = false,
+            hasMore = supportsSkip && items.isNotEmpty(),
+            currentPage = skip / 100,
+            supportsSkip = supportsSkip
+        )
+        val now = System.currentTimeMillis()
+        val policy = parseCachePolicy(response.headers()["Cache-Control"])
+        if (policy.cacheable) {
+            putCachedEntry(
+                cacheKey = cacheKey,
+                entry = CachedCatalogEntry(
+                    row = catalogRow,
+                    fetchedAtMs = now,
+                    policy = policy
+                )
+            )
+        } else {
+            removeCachedEntry(cacheKey)
+        }
+
+        return CatalogFetchResult.Success(row = catalogRow)
+    }
+
+    private fun parseCachePolicy(cacheControlHeader: String?): CachePolicy {
+        var noStore = false
+        var maxAgeSeconds: Long? = null
+        var staleRevalidateSeconds: Long? = null
+        var staleIfErrorSeconds: Long? = null
+
+        cacheControlHeader
+            ?.split(',')
+            ?.map { it.trim().lowercase() }
+            ?.forEach { directive ->
+                when {
+                    directive == "no-store" -> noStore = true
+                    directive == "no-cache" -> maxAgeSeconds = 0L
+                    directive.startsWith("max-age=") -> {
+                        maxAgeSeconds = directive.substringAfter('=').toLongOrNull()
+                    }
+                    directive.startsWith("stale-while-revalidate=") -> {
+                        staleRevalidateSeconds = directive.substringAfter('=').toLongOrNull()
+                    }
+                    directive.startsWith("stale-if-error=") -> {
+                        staleIfErrorSeconds = directive.substringAfter('=').toLongOrNull()
+                    }
+                }
+            }
+
+        if (noStore) {
+            return CachePolicy(
+                maxAgeMs = 0L,
+                staleRevalidateMs = 0L,
+                staleIfErrorMs = 0L,
+                cacheable = false
+            )
+        }
+
+        val maxAgeMs = (maxAgeSeconds ?: DEFAULT_MAX_AGE_SECONDS)
+            .coerceIn(0L, MAX_MAX_AGE_SECONDS) * 1000L
+        val staleRevalidateMs = (staleRevalidateSeconds ?: DEFAULT_STALE_REVALIDATE_SECONDS)
+            .coerceIn(0L, MAX_STALE_WINDOW_SECONDS) * 1000L
+        val staleIfErrorMs = (staleIfErrorSeconds ?: DEFAULT_STALE_IF_ERROR_SECONDS)
+            .coerceIn(0L, MAX_STALE_WINDOW_SECONDS) * 1000L
+
+        return CachePolicy(
+            maxAgeMs = maxAgeMs,
+            staleRevalidateMs = staleRevalidateMs,
+            staleIfErrorMs = staleIfErrorMs,
+            cacheable = true
+        )
+    }
+
+    private fun getCachedEntry(cacheKey: String, nowMs: Long): CachedCatalogEntry? {
+        synchronized(cacheLock) {
+            val entry = catalogCache[cacheKey] ?: return null
+            val ageMs = nowMs - entry.fetchedAtMs
+            if (ageMs > entry.policy.hardExpiryWindowMs) {
+                catalogCache.remove(cacheKey)
+                return null
+            }
+            return entry
+        }
+    }
+
+    private fun putCachedEntry(cacheKey: String, entry: CachedCatalogEntry) {
+        synchronized(cacheLock) {
+            catalogCache[cacheKey] = entry
+        }
+    }
+
+    private fun removeCachedEntry(cacheKey: String) {
+        synchronized(cacheLock) {
+            catalogCache.remove(cacheKey)
         }
     }
 

app/src/main/java/com/nuvio/tv/ui/components/CatalogRowSection.kt

@@ -80,7 +80,13 @@ fun CatalogRowSection(
     upFocusRequester: FocusRequester? = null,
     listState: LazyListState = rememberLazyListState(initialFirstVisibleItemIndex = initialScrollIndex)
 ) {
-    val seeAllCardShape = RoundedCornerShape(posterCardStyle.cornerRadius)
+    val seeAllCardShape = remember(posterCardStyle.cornerRadius) { RoundedCornerShape(posterCardStyle.cornerRadius) }
+    val seeAllFocusRingColor = NuvioColors.FocusRing
+    val seeAllFocusedBorder = remember(posterCardStyle.focusedBorderWidth, seeAllFocusRingColor, seeAllCardShape) {
+        Border(border = BorderStroke(posterCardStyle.focusedBorderWidth, seeAllFocusRingColor), shape = seeAllCardShape)
+    }
+    val seeAllShapeSpec = remember(seeAllCardShape) { CardDefaults.shape(shape = seeAllCardShape) }
+    val seeAllScale = remember(posterCardStyle.focusedScale) { CardDefaults.scale(focusedScale = posterCardStyle.focusedScale) }
     val currentOnItemFocused by rememberUpdatedState(onItemFocused)
     val currentOnItemFocus by rememberUpdatedState(onItemFocus)
 
@@ -185,8 +191,8 @@ fun CatalogRowSection(
         ) {
             itemsIndexed(
                 items = catalogRow.items,
-                key = { index, item ->
-                    "${catalogRow.addonId}_${catalogRow.apiType}_${catalogRow.catalogId}_${item.id}_$index"
+                key = { _, item ->
+                    "${catalogRow.addonId}_${catalogRow.apiType}_${catalogRow.catalogId}_${item.id}"
                 },
                 contentType = { _, _ -> "content_card" }
             ) { index, item ->
@@ -223,18 +229,15 @@ fun CatalogRowSection(
                             .width(posterCardStyle.width)
                             .height(posterCardStyle.height)
                             .then(directionalFocusModifier),
-                        shape = CardDefaults.shape(shape = seeAllCardShape),
+                        shape = seeAllShapeSpec,
                         colors = CardDefaults.colors(
                             containerColor = NuvioColors.BackgroundCard,
                             focusedContainerColor = NuvioColors.BackgroundCard
                         ),
                         border = CardDefaults.border(
-                            focusedBorder = Border(
-                                border = BorderStroke(posterCardStyle.focusedBorderWidth, NuvioColors.FocusRing),
-                                shape = seeAllCardShape
-                            )
+                            focusedBorder = seeAllFocusedBorder
                         ),
-                        scale = CardDefaults.scale(focusedScale = posterCardStyle.focusedScale)
+                        scale = seeAllScale
                     ) {
                         Box(
                             modifier = Modifier.fillMaxSize(),

app/src/main/java/com/nuvio/tv/ui/components/ContentCard.kt

@@ -40,6 +40,7 @@ import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.zIndex
 import com.nuvio.tv.R
@@ -61,6 +62,8 @@ import kotlinx.coroutines.delay
 private const val BACKDROP_ASPECT_RATIO = 16f / 9f
 private const val TRAILER_PREVIEW_REQUEST_FOCUS_DEBOUNCE_MS = 140L
 private val YEAR_REGEX = Regex("""\b(19|20)\d{2}\b""")
+private val WatchedIconAnimSpec = tween<Dp>(durationMillis = 180)
+private val TrailerCoverAlphaAnimSpec = tween<Float>(durationMillis = 250)
 
 @OptIn(ExperimentalTvMaterial3Api::class)
 @Composable
@@ -82,6 +85,18 @@ fun ContentCard(
     onClick: () -> Unit = {}
 ) {
     val cardShape = remember(posterCardStyle.cornerRadius) { RoundedCornerShape(posterCardStyle.cornerRadius) }
+    val focusRingColor = NuvioColors.FocusRing
+    val focusedBorder = remember(posterCardStyle.focusedBorderWidth, focusRingColor, cardShape) {
+        Border(
+            border = BorderStroke(posterCardStyle.focusedBorderWidth, focusRingColor),
+            shape = cardShape
+        )
+    }
+    val cardShapeSpec = remember(cardShape) { CardDefaults.shape(shape = cardShape) }
+    val cardScale = remember(posterCardStyle.focusedScale) { CardDefaults.scale(focusedScale = posterCardStyle.focusedScale) }
+    val focusRequesterModifier = remember(focusRequester) {
+        if (focusRequester != null) Modifier.focusRequester(focusRequester) else Modifier
+    }
     val baseCardWidth = when (item.posterShape) {
         PosterShape.POSTER -> posterCardStyle.width
         PosterShape.LANDSCAPE -> 260.dp
@@ -99,11 +114,16 @@ fun ContentCard(
     var interactionNonce by remember { mutableIntStateOf(0) }
     var isBackdropExpanded by remember { mutableStateOf(false) }
     var trailerFirstFrameRendered by remember(trailerPreviewUrl) { mutableStateOf(false) }
-    val watchedIconEndPadding by animateDpAsState(
-        targetValue = if (isFocused) 18.dp else 8.dp,
-        animationSpec = tween(durationMillis = 180),
-        label = "contentCardWatchedIconEndPadding"
-    )
+    val watchedIconEndPadding = if (isWatched) {
+        val padding by animateDpAsState(
+            targetValue = if (isFocused) 18.dp else 8.dp,
+            animationSpec = WatchedIconAnimSpec,
+            label = "contentCardWatchedIconEndPadding"
+        )
+        padding
+    } else {
+        8.dp
+    }
 
     val needsFocusState = focusedPosterBackdropExpandEnabled || focusedPosterBackdropTrailerEnabled
     val lastFocusedRef = remember { booleanArrayOf(false) }
@@ -275,21 +295,16 @@ fun ContentCard(
                     }
                     false
                 }
-                .then(
-                    if (focusRequester != null) Modifier.focusRequester(focusRequester) else Modifier
-                ),
-            shape = CardDefaults.shape(shape = cardShape),
+                .then(focusRequesterModifier),
+            shape = cardShapeSpec,
             colors = CardDefaults.colors(
                 containerColor = NuvioColors.BackgroundCard,
                 focusedContainerColor = NuvioColors.BackgroundCard
             ),
             border = CardDefaults.border(
-                focusedBorder = Border(
-                    border = BorderStroke(posterCardStyle.focusedBorderWidth, NuvioColors.FocusRing),
-                    shape = cardShape
-                )
+                focusedBorder = focusedBorder
             ),
-            scale = CardDefaults.scale(focusedScale = posterCardStyle.focusedScale)
+            scale = cardScale
         ) {
             Box(
                 modifier = Modifier
@@ -325,7 +340,7 @@ fun ContentCard(
                 val trailerCoverAlpha = if (shouldPlayTrailerPreview) {
                     val alpha by animateFloatAsState(
                         targetValue = if (!trailerFirstFrameRendered) 1f else 0f,
-                        animationSpec = tween(durationMillis = 250),
+                        animationSpec = TrailerCoverAlphaAnimSpec,
                         label = "trailerCoverAlpha"
                     )
                     alpha

app/src/main/java/com/nuvio/tv/ui/components/ContinueWatchingSection.kt

@@ -66,6 +66,8 @@ import java.util.concurrent.TimeUnit
 private val CwCardShape = RoundedCornerShape(12.dp)
 private val CwClipShape = RoundedCornerShape(topStart = 12.dp, topEnd = 12.dp)
 private val BadgeShape = RoundedCornerShape(4.dp)
+private val CwCardShapeSpec = CardDefaults.shape(shape = CwCardShape)
+private val CwCardScale = CardDefaults.scale(focusedScale = 1.02f)
 
 @OptIn(ExperimentalTvMaterial3Api::class, ExperimentalComposeUiApi::class)
 @Composable
@@ -289,6 +291,13 @@ fun ContinueWatchingCard(
             .build()
     }
 
+    val focusRingColor = NuvioColors.FocusRing
+    val cwFocusedBorder = remember(focusRingColor) {
+        Border(
+            border = BorderStroke(2.dp, focusRingColor),
+            shape = CwCardShape
+        )
+    }
     val bgColor = NuvioColors.Background
     val overlayBrush = remember(bgColor) {
         Brush.verticalGradient(
@@ -333,18 +342,15 @@ fun ContinueWatchingCard(
                 }
                 false
             },
-        shape = CardDefaults.shape(shape = CwCardShape),
+        shape = CwCardShapeSpec,
         colors = CardDefaults.colors(
             containerColor = NuvioColors.BackgroundCard,
             focusedContainerColor = NuvioColors.FocusBackground
         ),
         border = CardDefaults.border(
-            focusedBorder = Border(
-                border = BorderStroke(2.dp, NuvioColors.FocusRing),
-                shape = CwCardShape
-            )
+            focusedBorder = cwFocusedBorder
         ),
-        scale = CardDefaults.scale(focusedScale = 1.02f)
+        scale = CwCardScale
     ) {
         Column {
             // Thumbnail with progress overlay

app/src/main/java/com/nuvio/tv/ui/screens/home/ClassicHomeContent.kt

@@ -29,8 +29,8 @@ import com.nuvio.tv.ui.components.ContinueWatchingSection
 import com.nuvio.tv.ui.components.HeroCarousel
 import com.nuvio.tv.ui.components.PosterCardStyle
 
-/** Minimum interval between processed key repeat events to prevent HWUI overload. */
-private const val KEY_REPEAT_THROTTLE_MS = 80L
+/** Default minimum interval between processed key repeat events to prevent HWUI overload. */
+private const val KEY_REPEAT_THROTTLE_MS_DEFAULT = 80L
 
 private class FocusSnapshot(
     var rowIndex: Int,
@@ -56,9 +56,12 @@ fun ClassicHomeContent(
 ) {
 
     // Nested prefetch: when LazyColumn prefetches a row ahead of scrolling,
-    // pre-compose up to 2 ContentCards in its nested LazyRow across multiple frames.
-    // This spreads the composition work and prevents frame spikes when a new row scrolls in.
-    val nestedPrefetchStrategy = remember { LazyListPrefetchStrategy(nestedPrefetchItemCount = 2) }
+    // pre-compose ContentCards in its nested LazyRow across multiple frames.
+    // On low-tier devices, prefetch is disabled (0) to avoid decoder contention.
+    val adaptiveNestedPrefetchCount = uiState.nestedPrefetchItemCount
+    val nestedPrefetchStrategy = remember(adaptiveNestedPrefetchCount) {
+        LazyListPrefetchStrategy(nestedPrefetchItemCount = adaptiveNestedPrefetchCount)
+    }
 
     val columnListState = rememberLazyListState(
         initialFirstVisibleItemIndex = focusState.verticalScrollIndex,
@@ -137,6 +140,7 @@ fun ClassicHomeContent(
 
     // Throttle D-pad key repeats to prevent HWUI overload when a key is held down.
     var lastKeyRepeatTime by remember { mutableStateOf(0L) }
+    val keyRepeatThrottle = uiState.keyRepeatThrottleMs
 
     LazyColumn(
         state = columnListState,
@@ -146,7 +150,7 @@ fun ClassicHomeContent(
                 val native = event.nativeKeyEvent
                 if (native.action == AndroidKeyEvent.ACTION_DOWN && native.repeatCount > 0) {
                     val now = System.currentTimeMillis()
-                    if (now - lastKeyRepeatTime < KEY_REPEAT_THROTTLE_MS) {
+                    if (now - lastKeyRepeatTime < keyRepeatThrottle) {
                         return@onPreviewKeyEvent true // consume — too fast
                     }
                     lastKeyRepeatTime = now

app/src/main/java/com/nuvio/tv/ui/screens/home/GridHomeContent.kt

@@ -57,8 +57,8 @@ import com.nuvio.tv.ui.components.PosterCardDefaults
 import com.nuvio.tv.ui.components.PosterCardStyle
 import com.nuvio.tv.ui.theme.NuvioColors
 
-/** Minimum interval between processed key repeat events to prevent HWUI overload. */
-private const val KEY_REPEAT_THROTTLE_MS = 80L
+/** Default minimum interval between processed key repeat events to prevent HWUI overload. */
+private const val KEY_REPEAT_THROTTLE_MS_DEFAULT = 80L
 
 @OptIn(ExperimentalTvMaterial3Api::class, ExperimentalFoundationApi::class)
 @Composable
@@ -167,7 +167,7 @@ fun GridHomeContent(
                     val native = event.nativeKeyEvent
                     if (native.action == AndroidKeyEvent.ACTION_DOWN && native.repeatCount > 0) {
                         val now = System.currentTimeMillis()
-                        if (now - lastKeyRepeatTime[0] < KEY_REPEAT_THROTTLE_MS) {
+                        if (now - lastKeyRepeatTime[0] < uiState.keyRepeatThrottleMs) {
                             return@onPreviewKeyEvent true
                         }
                         lastKeyRepeatTime[0] = now

app/src/main/java/com/nuvio/tv/ui/screens/home/HomeScreen.kt

@@ -73,6 +73,7 @@ fun HomeScreen(
     LaunchedEffect(hasCatalogContent) {
         if (hasCatalogContent) {
             hasEnteredCatalogContent = true
+            viewModel.onCatalogContentRendered()
         }
     }
 
@@ -169,6 +170,15 @@ fun HomeScreen(
                                 animationSpec = tween(320)
                             )
                     ) {
+                        // Stabilize lambda identity — only recompute when the
+                        // watched status map itself changes, not on every uiState update.
+                        val watchedStatus = uiState.movieWatchedStatus
+                        val stableIsWatched = remember(watchedStatus) {
+                            { item: MetaPreview ->
+                                watchedStatus[homeItemStatusKey(item.id, item.apiType)] == true
+                            }
+                        }
+
                         when (uiState.homeLayout) {
                             HomeLayout.CLASSIC -> ClassicHomeRoute(
                                 viewModel = viewModel,
@@ -177,9 +187,7 @@ fun HomeScreen(
                                 onNavigateToDetail = onNavigateToDetail,
                                 onContinueWatchingClick = onContinueWatchingClick,
                                 onNavigateToCatalogSeeAll = onNavigateToCatalogSeeAll,
-                                isCatalogItemWatched = { item ->
-                                    uiState.movieWatchedStatus[homeItemStatusKey(item.id, item.apiType)] == true
-                                },
+                                isCatalogItemWatched = stableIsWatched,
                                 onCatalogItemLongPress = { item, addonBaseUrl ->
                                     posterOptionsTarget = HomePosterOptionsTarget(item, addonBaseUrl)
                                 }
@@ -192,9 +200,7 @@ fun HomeScreen(
                                 onNavigateToDetail = onNavigateToDetail,
                                 onContinueWatchingClick = onContinueWatchingClick,
                                 onNavigateToCatalogSeeAll = onNavigateToCatalogSeeAll,
-                                isCatalogItemWatched = { item ->
-                                    uiState.movieWatchedStatus[homeItemStatusKey(item.id, item.apiType)] == true
-                                },
+                                isCatalogItemWatched = stableIsWatched,
                                 onCatalogItemLongPress = { item, addonBaseUrl ->
                                     posterOptionsTarget = HomePosterOptionsTarget(item, addonBaseUrl)
                                 }
@@ -205,9 +211,7 @@ fun HomeScreen(
                                 uiState = uiState,
                                 onNavigateToDetail = onNavigateToDetail,
                                 onContinueWatchingClick = onContinueWatchingClick,
-                                isCatalogItemWatched = { item ->
-                                    uiState.movieWatchedStatus[homeItemStatusKey(item.id, item.apiType)] == true
-                                },
+                                isCatalogItemWatched = stableIsWatched,
                                 onCatalogItemLongPress = { item, addonBaseUrl ->
                                     posterOptionsTarget = HomePosterOptionsTarget(item, addonBaseUrl)
                                 }

app/src/main/java/com/nuvio/tv/ui/screens/home/HomeUiState.kt

@@ -36,7 +36,9 @@ data class HomeUiState(
     val movieWatchedStatus: Map<String, Boolean> = emptyMap(),
     val posterLibraryPending: Set<String> = emptySet(),
     val movieWatchedPending: Set<String> = emptySet(),
-    val gridItems: List<GridItem> = emptyList()
+    val gridItems: List<GridItem> = emptyList(),
+    val keyRepeatThrottleMs: Long = 80L,
+    val nestedPrefetchItemCount: Int = 2
 )
 
 @Immutable

app/src/main/java/com/nuvio/tv/ui/screens/home/HomeViewModel.kt

@@ -4,6 +4,8 @@ import android.util.Log
 import androidx.compose.runtime.mutableStateMapOf
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.nuvio.tv.core.device.DeviceCapabilities
+import com.nuvio.tv.core.device.DeviceTier
 import com.nuvio.tv.core.network.NetworkResult
 import com.nuvio.tv.core.tmdb.TmdbMetadataService
 import com.nuvio.tv.core.tmdb.TmdbService
@@ -76,7 +78,8 @@ class HomeViewModel @Inject constructor(
     private val traktSettingsDataStore: TraktSettingsDataStore,
     private val tmdbService: TmdbService,
     private val tmdbMetadataService: TmdbMetadataService,
-    private val trailerService: TrailerService
+    private val trailerService: TrailerService,
+    private val deviceCapabilities: DeviceCapabilities
 ) : ViewModel() {
     companion object {
         private const val TAG = "HomeViewModel"
@@ -84,7 +87,7 @@ class HomeViewModel @Inject constructor(
         private const val MAX_RECENT_PROGRESS_ITEMS = 300
         private const val MAX_NEXT_UP_LOOKUPS = 24
         private const val MAX_NEXT_UP_CONCURRENCY = 4
-        private const val MAX_CATALOG_LOAD_CONCURRENCY = 4
+        private const val CATALOG_WAVE_DELAY_MS = 120L
         private const val EXTERNAL_META_PREFETCH_FOCUS_DEBOUNCE_MS = 220L
     }
 
@@ -104,19 +107,33 @@ class HomeViewModel @Inject constructor(
 
     private val catalogsMap = linkedMapOf<String, CatalogRow>()
     private val catalogOrder = mutableListOf<String>()
+    private val activeCatalogLoadJobs = mutableMapOf<String, Job>()
     private var addonsCache: List<Addon> = emptyList()
     private var homeCatalogOrderKeys: List<String> = emptyList()
     private var disabledHomeCatalogKeys: Set<String> = emptySet()
     private var currentHeroCatalogKeys: List<String> = emptyList()
+    private var activeCatalogLoadSessionId: Long = 0L
     private var catalogUpdateJob: Job? = null
-    private var hasRenderedFirstCatalog = false
-    private val catalogLoadSemaphore = Semaphore(MAX_CATALOG_LOAD_CONCURRENCY)
+    private var hasDispatchedFirstCatalogBatch = false
+    @Volatile
+    private var hasCatalogContentDrawn = false
+    private var reconcilePosterObserversJob: Job? = null
+    private var hasBootstrappedPosterObservers = false
+    private val catalogLoadSemaphore = Semaphore(
+        when (deviceCapabilities.tier) {
+            DeviceTier.LOW -> 2
+            DeviceTier.MEDIUM -> 3
+            DeviceTier.HIGH -> 4
+        }
+    )
     private var pendingCatalogLoads = 0
     private data class TruncatedRowCacheEntry(
         val sourceRow: CatalogRow,
         val truncatedRow: CatalogRow
     )
     private val truncatedRowCache = mutableMapOf<String, TruncatedRowCacheEntry>()
+    private var catalogVersion = 0L
+    private var lastProcessedCatalogVersion = -1L
     private val trailerPreviewLoadingIds = mutableSetOf<String>()
     private val trailerPreviewNegativeCache = mutableSetOf<String>()
     private val trailerPreviewUrlsState = mutableStateMapOf<String, String>()
@@ -132,6 +149,9 @@ class HomeViewModel @Inject constructor(
     private var pendingExternalMetaPrefetchItemId: String? = null
     private val posterLibraryObserverJobs = mutableMapOf<String, Job>()
     private val movieWatchedObserverJobs = mutableMapOf<String, Job>()
+    private val pendingLibraryStatusUpdates = java.util.concurrent.ConcurrentHashMap<String, Boolean>()
+    private val pendingWatchedStatusUpdates = java.util.concurrent.ConcurrentHashMap<String, Boolean>()
+    private var posterStatusFlushJob: Job? = null
     @Volatile
     private var externalMetaPrefetchEnabled: Boolean = false
     @Volatile
@@ -243,6 +263,7 @@ class HomeViewModel @Inject constructor(
                         previousState.heroSectionEnabled != prefs.heroSectionEnabled ||
                         previousState.homeLayout != prefs.layout
                 currentHeroCatalogKeys = prefs.heroCatalogKeys
+                val isLowTier = deviceCapabilities.tier == DeviceTier.LOW
                 _uiState.update {
                     it.copy(
                         homeLayout = prefs.layout,
@@ -252,14 +273,16 @@ class HomeViewModel @Inject constructor(
                         catalogAddonNameEnabled = prefs.catalogAddonNameEnabled,
                         catalogTypeSuffixEnabled = prefs.catalogTypeSuffixEnabled,
                         modernLandscapePostersEnabled = prefs.modernLandscapePostersEnabled,
-                        focusedPosterBackdropExpandEnabled = prefs.focusedBackdropExpandEnabled,
+                        focusedPosterBackdropExpandEnabled = if (isLowTier) false else prefs.focusedBackdropExpandEnabled,
                         focusedPosterBackdropExpandDelaySeconds = prefs.focusedBackdropExpandDelaySeconds,
-                        focusedPosterBackdropTrailerEnabled = prefs.focusedBackdropTrailerEnabled,
+                        focusedPosterBackdropTrailerEnabled = if (isLowTier) false else prefs.focusedBackdropTrailerEnabled,
                         focusedPosterBackdropTrailerMuted = prefs.focusedBackdropTrailerMuted,
                         focusedPosterBackdropTrailerPlaybackTarget = prefs.focusedBackdropTrailerPlaybackTarget,
                         posterCardWidthDp = prefs.posterCardWidthDp,
                         posterCardHeightDp = prefs.posterCardHeightDp,
-                        posterCardCornerRadiusDp = prefs.posterCardCornerRadiusDp
+                        posterCardCornerRadiusDp = prefs.posterCardCornerRadiusDp,
+                        keyRepeatThrottleMs = deviceCapabilities.keyRepeatThrottleMs,
+                        nestedPrefetchItemCount = deviceCapabilities.nestedPrefetchItemCount
                     )
                 }
                 if (shouldRefreshCatalogPresentation) {
@@ -376,6 +399,7 @@ class HomeViewModel @Inject constructor(
     fun onItemFocus(item: MetaPreview) {
         if (startupGracePeriodActive) return
         if (!externalMetaPrefetchEnabled) return
+        if (deviceCapabilities.tier == DeviceTier.LOW) return
         if (item.id in prefetchedExternalMetaIds) return
         if (pendingExternalMetaPrefetchItemId == item.id) return
 
@@ -423,6 +447,7 @@ class HomeViewModel @Inject constructor(
                     val mutableItems = row.items.toMutableList()
                     mutableItems[itemIndex] = merged
                     catalogsMap[key] = row.copy(items = mutableItems)
+                    catalogVersion++
                     truncatedRowCache.remove(key)
                 }
             }
@@ -452,7 +477,9 @@ class HomeViewModel @Inject constructor(
 
     private fun loadHomeCatalogOrderPreference() {
         viewModelScope.launch {
-            layoutPreferenceDataStore.homeCatalogOrderKeys.collectLatest { keys ->
+            layoutPreferenceDataStore.homeCatalogOrderKeys
+                .distinctUntilChanged()
+                .collectLatest { keys ->
                 homeCatalogOrderKeys = keys
                 rebuildCatalogOrder(addonsCache)
                 scheduleUpdateCatalogRows()
@@ -462,7 +489,9 @@ class HomeViewModel @Inject constructor(
 
     private fun loadDisabledHomeCatalogPreference() {
         viewModelScope.launch {
-            layoutPreferenceDataStore.disabledHomeCatalogKeys.collectLatest { keys ->
+            layoutPreferenceDataStore.disabledHomeCatalogKeys
+                .distinctUntilChanged()
+                .collectLatest { keys ->
                 disabledHomeCatalogKeys = keys.toSet()
                 rebuildCatalogOrder(addonsCache)
                 if (addonsCache.isNotEmpty()) {
@@ -560,36 +589,39 @@ class HomeViewModel @Inject constructor(
                     showUnairedNextUp = showUnairedNextUp
                 )
             }.collectLatest { snapshot ->
-                val items = snapshot.items
-                val daysCap = snapshot.daysCap
+                val preparedState = withContext(Dispatchers.Default) {
+                    val items = snapshot.items
+                    val daysCap = snapshot.daysCap
+                    val cutoffMs = if (daysCap == TraktSettingsDataStore.CONTINUE_WATCHING_DAYS_CAP_ALL) {
+                        null
+                    } else {
+                        val windowMs = daysCap.toLong() * 24L * 60L * 60L * 1000L
+                        System.currentTimeMillis() - windowMs
+                    }
+                    val recentItems = items
+                        .asSequence()
+                        .filter { progress -> cutoffMs == null || progress.lastWatched >= cutoffMs }
+                        .sortedByDescending { it.lastWatched }
+                        .take(MAX_RECENT_PROGRESS_ITEMS)
+                        .toList()
+
+                    val inProgressOnly = deduplicateInProgress(
+                        recentItems.filter { shouldTreatAsInProgressForContinueWatching(it) }
+                    ).map { progress ->
+                        ContinueWatchingItem.InProgress(progress = progress)
+                    }
+
+                    ContinueWatchingPreparedState(
+                        allProgressCount = items.size,
+                        recentItems = recentItems,
+                        inProgressOnly = inProgressOnly
+                    )
+                }
+                val recentItems = preparedState.recentItems
+                val inProgressOnly = preparedState.inProgressOnly
                 val dismissedNextUp = snapshot.dismissedNextUp
                 val showUnairedNextUp = snapshot.showUnairedNextUp
-                val cutoffMs = if (daysCap == TraktSettingsDataStore.CONTINUE_WATCHING_DAYS_CAP_ALL) {
-                    null
-                } else {
-                    val windowMs = daysCap.toLong() * 24L * 60L * 60L * 1000L
-                    System.currentTimeMillis() - windowMs
-                }
-                val recentItems = items
-                    .asSequence()
-                    .filter { progress -> cutoffMs == null || progress.lastWatched >= cutoffMs }
-                    .sortedByDescending { it.lastWatched }
-                    .take(MAX_RECENT_PROGRESS_ITEMS)
-                    .toList()
-
-                Log.d("HomeViewModel", "allProgress emitted=${items.size} recentWindow=${recentItems.size}")
-
-                val inProgressOnly = buildList {
-                    deduplicateInProgress(
-                        recentItems.filter { shouldTreatAsInProgressForContinueWatching(it) }
-                    ).forEach { progress ->
-                        add(
-                            ContinueWatchingItem.InProgress(
-                                progress = progress
-                            )
-                        )
-                    }
-                }
+                Log.d("HomeViewModel", "allProgress emitted=${preparedState.allProgressCount} recentWindow=${recentItems.size}")
 
                 Log.d("HomeViewModel", "inProgressOnly: ${inProgressOnly.size} items after filter+dedup")
 
@@ -602,6 +634,14 @@ class HomeViewModel @Inject constructor(
                     }
                 }
 
+                // Wait for first catalog to render before enriching, so enrichment
+                // state updates don't compete with the initial catalog paint.
+                if (!hasCatalogContentDrawn) {
+                    withTimeoutOrNull(5000L) {
+                        while (!hasCatalogContentDrawn) { delay(100) }
+                    }
+                }
+
                 // Then enrich Next Up and item details in background.
                 enrichContinueWatchingProgressively(
                     allProgress = recentItems,
@@ -621,6 +661,12 @@ class HomeViewModel @Inject constructor(
         val showUnairedNextUp: Boolean
     )
 
+    private data class ContinueWatchingPreparedState(
+        val allProgressCount: Int,
+        val recentItems: List<WatchProgress>,
+        val inProgressOnly: List<ContinueWatchingItem.InProgress>
+    )
+
     private data class NextUpArtworkFallback(
         val thumbnail: String?,
         val backdrop: String?,
@@ -692,34 +738,35 @@ class HomeViewModel @Inject constructor(
         dismissedNextUp: Set<String>,
         showUnairedNextUp: Boolean
     ) = coroutineScope {
-        val inProgressIds = inProgressItems
-            .map { it.progress.contentId }
-            .filter { it.isNotBlank() }
-            .toSet()
-
-        val latestCompletedBySeries = allProgress
-            .filter { progress ->
-                isSeriesType(progress.contentType) &&
-                    progress.season != null &&
-                    progress.episode != null &&
-                    progress.season != 0 &&
-                    progress.isCompleted() &&
-                    progress.source != WatchProgress.SOURCE_TRAKT_PLAYBACK
-            }
-            .groupBy { it.contentId }
-            .mapNotNull { (_, items) ->
-                items.maxWithOrNull(
-                    compareBy<WatchProgress>(
-                        { it.lastWatched },
-                        { it.season ?: -1 },
-                        { it.episode ?: -1 }
+        val latestCompletedBySeries = withContext(Dispatchers.Default) {
+            val inProgressIds = inProgressItems
+                .map { it.progress.contentId }
+                .filter { it.isNotBlank() }
+                .toSet()
+            allProgress
+                .filter { progress ->
+                    isSeriesType(progress.contentType) &&
+                        progress.season != null &&
+                        progress.episode != null &&
+                        progress.season != 0 &&
+                        progress.isCompleted() &&
+                        progress.source != WatchProgress.SOURCE_TRAKT_PLAYBACK
+                }
+                .groupBy { it.contentId }
+                .mapNotNull { (_, items) ->
+                    items.maxWithOrNull(
+                        compareBy<WatchProgress>(
+                            { it.lastWatched },
+                            { it.season ?: -1 },
+                            { it.episode ?: -1 }
+                        )
                     )
-                )
-            }
-            .filter { it.contentId !in inProgressIds }
-            .filter { progress -> nextUpDismissKey(progress.contentId) !in dismissedNextUp }
-            .sortedByDescending { it.lastWatched }
-            .take(MAX_NEXT_UP_LOOKUPS)
+                }
+                .filter { it.contentId !in inProgressIds }
+                .filter { progress -> nextUpDismissKey(progress.contentId) !in dismissedNextUp }
+                .sortedByDescending { it.lastWatched }
+                .take(MAX_NEXT_UP_LOOKUPS)
+        }
 
         if (latestCompletedBySeries.isEmpty()) {
             return@coroutineScope
@@ -741,7 +788,7 @@ class HomeViewModel @Inject constructor(
                     ) ?: return@withPermit
                     mergeMutex.withLock {
                         nextUpByContent[progress.contentId] = nextUp
-                        if (nextUpByContent.size - lastEmittedNextUpCount >= 2) {
+                        if (nextUpByContent.size - lastEmittedNextUpCount >= 4) {
                             val nextUpItems = nextUpByContent.values.toList()
                             _uiState.update {
                                 val mergedItems = mergeContinueWatchingItems(
@@ -802,7 +849,7 @@ class HomeViewModel @Inject constructor(
 
             if (enrichedItem != item) {
                 enrichedByProgress[item.progress] = enrichedItem
-                if (enrichedByProgress.size - lastAppliedCount >= 2) {
+                if (enrichedByProgress.size - lastAppliedCount >= 4) {
                     applyInProgressEpisodeDetailEnrichment(enrichedByProgress)
                     lastAppliedCount = enrichedByProgress.size
                 }
@@ -1177,6 +1224,7 @@ class HomeViewModel @Inject constructor(
         viewModelScope.launch {
             addonRepository.getInstalledAddons()
                 .distinctUntilChanged()
+                .debounce(200)
                 .collectLatest { addons ->
                     addonsCache = addons
                     loadAllCatalogs(addons)
@@ -1185,13 +1233,19 @@ class HomeViewModel @Inject constructor(
     }
 
     private suspend fun loadAllCatalogs(addons: List<Addon>) {
+        val catalogLoadSessionId = startCatalogLoadSession()
         _uiState.update { it.copy(isLoading = true, error = null, installedAddonsCount = addons.size) }
         catalogOrder.clear()
         catalogsMap.clear()
+        catalogVersion++
+        lastProcessedCatalogVersion = -1L
+        reconcilePosterObserversJob?.cancel()
+        hasBootstrappedPosterObservers = false
+        hasDispatchedFirstCatalogBatch = false
+        hasCatalogContentDrawn = false
         reconcilePosterStatusObservers(emptyList())
         _fullCatalogRows.value = emptyList()
         truncatedRowCache.clear()
-        hasRenderedFirstCatalog = false
         trailerPreviewLoadingIds.clear()
         trailerPreviewNegativeCache.clear()
         trailerPreviewUrlsState.clear()
@@ -1206,6 +1260,7 @@ class HomeViewModel @Inject constructor(
 
         try {
             if (addons.isEmpty()) {
+                if (catalogLoadSessionId != activeCatalogLoadSessionId) return
                 _uiState.update { it.copy(isLoading = false, error = "No addons installed") }
                 return
             }
@@ -1213,6 +1268,7 @@ class HomeViewModel @Inject constructor(
             rebuildCatalogOrder(addons)
 
             if (catalogOrder.isEmpty()) {
+                if (catalogLoadSessionId != activeCatalogLoadSessionId) return
                 _uiState.update { it.copy(isLoading = false, error = "No catalog addons installed") }
                 return
             }
@@ -1232,17 +1288,52 @@ class HomeViewModel @Inject constructor(
                     .map { catalog -> addon to catalog }
             }
             pendingCatalogLoads = catalogsToLoad.size
-            catalogsToLoad.forEach { (addon, catalog) ->
-                loadCatalog(addon, catalog)
+
+            // Stagger catalog dispatching in waves so the UI thread gets breathing
+            // room between batches to render + start Coil image loads.
+            val firstWaveSize = if (deviceCapabilities.tier == DeviceTier.LOW) 1 else 2
+            val subsequentWaveSize = if (deviceCapabilities.tier == DeviceTier.LOW) 2 else 3
+
+            val firstWave = catalogsToLoad.take(firstWaveSize)
+            val remaining = catalogsToLoad.drop(firstWaveSize)
+
+            firstWave.forEach { (addon, catalog) -> loadCatalog(addon, catalog, catalogLoadSessionId) }
+
+            val waveDelayMs = if (deviceCapabilities.tier == DeviceTier.LOW) {
+                CATALOG_WAVE_DELAY_MS * 2  // Extra breathing room on constrained devices
+            } else {
+                CATALOG_WAVE_DELAY_MS
+            }
+            remaining.chunked(subsequentWaveSize).forEach { wave ->
+                delay(waveDelayMs)
+                if (catalogLoadSessionId != activeCatalogLoadSessionId) return
+                wave.forEach { (addon, catalog) -> loadCatalog(addon, catalog, catalogLoadSessionId) }
             }
         } catch (e: Exception) {
+            if (catalogLoadSessionId != activeCatalogLoadSessionId) return
             _uiState.update { it.copy(isLoading = false, error = e.message) }
         }
     }
 
-    private fun loadCatalog(addon: Addon, catalog: CatalogDescriptor) {
-        viewModelScope.launch {
+    private fun startCatalogLoadSession(): Long {
+        activeCatalogLoadSessionId += 1
+        activeCatalogLoadJobs.values.forEach { it.cancel() }
+        activeCatalogLoadJobs.clear()
+        _loadingCatalogs.value = emptySet()
+        pendingCatalogLoads = 0
+        return activeCatalogLoadSessionId
+    }
+
+    private fun loadCatalog(addon: Addon, catalog: CatalogDescriptor, sessionId: Long) {
+        val key = catalogKey(
+            addonId = addon.id,
+            type = catalog.apiType,
+            catalogId = catalog.id
+        )
+        activeCatalogLoadJobs.remove(key)?.cancel()
+        val job = viewModelScope.launch {
             catalogLoadSemaphore.withPermit {
+                if (sessionId != activeCatalogLoadSessionId) return@withPermit
                 val supportsSkip = catalog.extra.any { it.name == "skip" }
                 Log.d(
                     TAG,
@@ -1258,14 +1349,11 @@ class HomeViewModel @Inject constructor(
                     skip = 0,
                     supportsSkip = supportsSkip
                 ).collect { result ->
+                    if (sessionId != activeCatalogLoadSessionId) return@collect
                     when (result) {
                         is NetworkResult.Success -> {
-                            val key = catalogKey(
-                                addonId = addon.id,
-                                type = catalog.apiType,
-                                catalogId = catalog.id
-                            )
                             catalogsMap[key] = result.data
+                            catalogVersion++
                             pendingCatalogLoads = (pendingCatalogLoads - 1).coerceAtLeast(0)
                             Log.d(
                                 TAG,
@@ -1286,6 +1374,12 @@ class HomeViewModel @Inject constructor(
                 }
             }
         }
+        activeCatalogLoadJobs[key] = job
+        job.invokeOnCompletion {
+            if (activeCatalogLoadJobs[key] == job) {
+                activeCatalogLoadJobs.remove(key)
+            }
+        }
     }
 
     private fun loadMoreCatalogItems(catalogId: String, addonId: String, type: String) {
@@ -1297,6 +1391,7 @@ class HomeViewModel @Inject constructor(
 
         // Mark loading via lightweight separate flow — avoids full state cascade
         catalogsMap[key] = currentRow.copy(isLoading = true)
+        catalogVersion++
         _loadingCatalogs.update { it + key }
 
         viewModelScope.launch {
@@ -1318,11 +1413,13 @@ class HomeViewModel @Inject constructor(
                     is NetworkResult.Success -> {
                         val mergedItems = currentRow.items + result.data.items
                         catalogsMap[key] = result.data.copy(items = mergedItems)
+                        catalogVersion++
                         _loadingCatalogs.update { it - key }
                         scheduleUpdateCatalogRows()
                     }
                     is NetworkResult.Error -> {
                         catalogsMap[key] = currentRow.copy(isLoading = false)
+                        catalogVersion++
                         _loadingCatalogs.update { it - key }
                         scheduleUpdateCatalogRows()
                     }
@@ -1338,13 +1435,13 @@ class HomeViewModel @Inject constructor(
             val debounceMs = when {
                 // First render: use minimal debounce to show content ASAP while still
                 // batching near-simultaneous arrivals.
-                !hasRenderedFirstCatalog && catalogsMap.isNotEmpty() -> {
-                    hasRenderedFirstCatalog = true
+                !hasDispatchedFirstCatalogBatch && catalogsMap.isNotEmpty() -> {
+                    hasDispatchedFirstCatalogBatch = true
                     50L
                 }
-                pendingCatalogLoads > 8 -> 200L
-                pendingCatalogLoads > 3 -> 150L
-                pendingCatalogLoads > 0 -> 100L
+                pendingCatalogLoads > 8 -> 350L
+                pendingCatalogLoads > 3 -> 250L
+                pendingCatalogLoads > 0 -> 150L
                 else -> 50L
             }
             delay(debounceMs)
@@ -1353,6 +1450,11 @@ class HomeViewModel @Inject constructor(
     }
 
     private suspend fun updateCatalogRows() {
+        // Skip expensive recomputation when catalog data hasn't changed.
+        val currentVersion = catalogVersion
+        if (currentVersion == lastProcessedCatalogVersion && !_uiState.value.isLoading) return
+        lastProcessedCatalogVersion = currentVersion
+
         // Snapshot mutable state before entering background context
         val orderedKeys = catalogOrder.toList()
         val catalogSnapshot = catalogsMap.toMap()
@@ -1465,10 +1567,13 @@ class HomeViewModel @Inject constructor(
             Triple(computedDisplayRows, computedHeroItems, computedGridItems)
         }
 
-        // Full (untruncated) rows for CatalogSeeAllScreen
-        val fullRows = orderedKeys.mapNotNull { key -> catalogSnapshot[key] }
-        _fullCatalogRows.update { rows ->
-            if (rows == fullRows) rows else fullRows
+        // Full (untruncated) rows for CatalogSeeAllScreen — only needed when
+        // user navigates to SeeAll, so defer during the initial bulk load.
+        if (pendingCatalogLoads <= 0) {
+            val fullRows = orderedKeys.mapNotNull { key -> catalogSnapshot[key] }
+            _fullCatalogRows.update { rows ->
+                if (rows == fullRows) rows else fullRows
+            }
         }
 
         // Emit un-enriched hero items immediately so the UI renders without waiting for TMDB
@@ -1488,12 +1593,14 @@ class HomeViewModel @Inject constructor(
             )
         }
 
-        // Launch hero enrichment in the background — updates heroItems when done
+        // Launch hero enrichment in the background — updates heroItems when done.
+        // Defer during the initial bulk load to avoid 28 TMDB API calls competing
+        // with catalog network requests and triggering extra recompositions.
         val tmdbSettings = currentTmdbSettings
         val shouldUseEnrichedHeroItems = tmdbSettings.enabled &&
             (tmdbSettings.useArtwork || tmdbSettings.useBasicInfo || tmdbSettings.useDetails)
 
-        if (shouldUseEnrichedHeroItems && baseHeroItems.isNotEmpty()) {
+        if (shouldUseEnrichedHeroItems && baseHeroItems.isNotEmpty() && pendingCatalogLoads <= 0) {
             heroEnrichmentJob?.cancel()
             heroEnrichmentJob = viewModelScope.launch {
                 val enrichmentSignature = heroEnrichmentSignature(baseHeroItems, tmdbSettings)
@@ -1529,10 +1636,72 @@ class HomeViewModel @Inject constructor(
             lastHeroEnrichedItems = emptyList()
         }
 
-        reconcilePosterStatusObservers(displayRows)
+        // Defer poster-status observers during the initial bulk load to avoid
+        // launching hundreds of coroutines that compete with catalog loading + rendering.
+        if (pendingCatalogLoads <= 0) {
+            scheduleReconcilePosterStatusObservers(displayRows)
+        }
     }
 
-    private fun reconcilePosterStatusObservers(rows: List<CatalogRow>) {
+    private fun scheduleReconcilePosterStatusObservers(rows: List<CatalogRow>) {
+        reconcilePosterObserversJob?.cancel()
+        val rowsSnapshot = rows.toList()
+        reconcilePosterObserversJob = viewModelScope.launch {
+            if (!hasBootstrappedPosterObservers) {
+                withTimeoutOrNull(4000L) {
+                    while (!hasCatalogContentDrawn) {
+                        delay(50)
+                    }
+                }
+            }
+            delay(if (hasBootstrappedPosterObservers) 120L else 450L)
+            reconcilePosterStatusObservers(rowsSnapshot)
+            hasBootstrappedPosterObservers = true
+        }
+    }
+
+    fun onCatalogContentRendered() {
+        hasCatalogContentDrawn = true
+    }
+
+    private fun schedulePosterStatusFlush() {
+        if (posterStatusFlushJob?.isActive == true) return
+        posterStatusFlushJob = viewModelScope.launch {
+            delay(200)
+            flushPosterStatusUpdates()
+        }
+    }
+
+    private fun flushPosterStatusUpdates() {
+        val libraryBatch = HashMap(pendingLibraryStatusUpdates)
+        val watchedBatch = HashMap(pendingWatchedStatusUpdates)
+        if (libraryBatch.isEmpty() && watchedBatch.isEmpty()) return
+        pendingLibraryStatusUpdates.keys.removeAll(libraryBatch.keys)
+        pendingWatchedStatusUpdates.keys.removeAll(watchedBatch.keys)
+
+        _uiState.update { state ->
+            val newLibrary = if (libraryBatch.isEmpty()) {
+                state.posterLibraryMembership
+            } else {
+                state.posterLibraryMembership + libraryBatch
+            }
+            val newWatched = if (watchedBatch.isEmpty()) {
+                state.movieWatchedStatus
+            } else {
+                state.movieWatchedStatus + watchedBatch
+            }
+            if (newLibrary == state.posterLibraryMembership && newWatched == state.movieWatchedStatus) {
+                state
+            } else {
+                state.copy(
+                    posterLibraryMembership = newLibrary,
+                    movieWatchedStatus = newWatched
+                )
+            }
+        }
+    }
+
+    private suspend fun reconcilePosterStatusObservers(rows: List<CatalogRow>) {
         val desiredItemsByKey = linkedMapOf<String, Pair<String, String>>()
         rows.asSequence()
             .flatMap { row -> row.items.asSequence() }
@@ -1558,26 +1727,24 @@ class HomeViewModel @Inject constructor(
                 movieWatchedObserverJobs.remove(staleKey)?.cancel()
             }
 
+        // Launch observers in chunks to avoid a burst of 300+ coroutines
+        // all emitting initial values simultaneously.
+        var launchedInChunk = 0
         desiredItemsByKey.forEach { (statusKey, itemRef) ->
             val itemId = itemRef.first
             val itemType = itemRef.second
+            var launchedAny = false
 
             if (statusKey !in posterLibraryObserverJobs) {
                 posterLibraryObserverJobs[statusKey] = viewModelScope.launch {
                     libraryRepository.isInLibrary(itemId = itemId, itemType = itemType)
                         .distinctUntilChanged()
                         .collectLatest { isInLibrary ->
-                            _uiState.update { state ->
-                                if (state.posterLibraryMembership[statusKey] == isInLibrary) {
-                                    state
-                                } else {
-                                    state.copy(
-                                        posterLibraryMembership = state.posterLibraryMembership + (statusKey to isInLibrary)
-                                    )
-                                }
-                            }
+                            pendingLibraryStatusUpdates[statusKey] = isInLibrary
+                            schedulePosterStatusFlush()
                         }
                 }
+                launchedAny = true
             }
 
             if (itemType.equals("movie", ignoreCase = true)) {
@@ -1586,21 +1753,33 @@ class HomeViewModel @Inject constructor(
                         watchProgressRepository.isWatched(contentId = itemId)
                             .distinctUntilChanged()
                             .collectLatest { watched ->
-                                _uiState.update { state ->
-                                    if (state.movieWatchedStatus[statusKey] == watched) {
-                                        state
-                                    } else {
-                                        state.copy(
-                                            movieWatchedStatus = state.movieWatchedStatus + (statusKey to watched)
-                                        )
-                                    }
-                                }
+                                pendingWatchedStatusUpdates[statusKey] = watched
+                                schedulePosterStatusFlush()
                             }
                     }
+                    launchedAny = true
+                }
+            }
+
+            if (launchedAny) {
+                launchedInChunk++
+                if (launchedInChunk >= 30) {
+                    launchedInChunk = 0
+                    // Yield to let pending coroutines emit their first values
+                    // and batch into a single flush before launching the next chunk.
+                    kotlinx.coroutines.yield()
                 }
             }
         }
 
+        // Flush any buffered updates before trimming stale entries.
+        posterStatusFlushJob?.cancel()
+        flushPosterStatusUpdates()
+
+        // Remove stale entries from pending buffers.
+        pendingLibraryStatusUpdates.keys.retainAll(desiredKeys)
+        pendingWatchedStatusUpdates.keys.retainAll(desiredMovieKeys)
+
         _uiState.update { state ->
             val trimmedLibraryMembership =
                 state.posterLibraryMembership.filterKeys { it in desiredKeys }
@@ -1895,10 +2074,16 @@ class HomeViewModel @Inject constructor(
     }
 
     override fun onCleared() {
+        posterStatusFlushJob?.cancel()
+        reconcilePosterObserversJob?.cancel()
+        activeCatalogLoadJobs.values.forEach { it.cancel() }
+        activeCatalogLoadJobs.clear()
         posterLibraryObserverJobs.values.forEach { it.cancel() }
         movieWatchedObserverJobs.values.forEach { it.cancel() }
         posterLibraryObserverJobs.clear()
         movieWatchedObserverJobs.clear()
+        pendingLibraryStatusUpdates.clear()
+        pendingWatchedStatusUpdates.clear()
         super.onCleared()
     }
 }

app/src/main/java/com/nuvio/tv/ui/screens/home/ModernHomeContent.kt

@@ -97,7 +97,8 @@ import kotlinx.coroutines.delay
 import android.view.KeyEvent as AndroidKeyEvent
 import kotlinx.coroutines.flow.distinctUntilChanged
 
-private const val KEY_REPEAT_THROTTLE_MS = 80L
+private const val KEY_REPEAT_THROTTLE_MS_DEFAULT = 80L
+private val HeroTransitionAnimSpec = tween<Float>(durationMillis = 480)
 
 @Composable
 fun ModernHomeContent(
@@ -439,7 +440,9 @@ fun ModernHomeContent(
         }
     }
 
-    val activeRow by remember(carouselRows, rowByKey, activeRowKey) {
+    // Use carouselRows/rowByKey as remember keys (plain collections, not snapshot-observable).
+    // activeRowKey is snapshot-observable via mutableStateOf — derivedStateOf tracks it automatically.
+    val activeRow by remember(carouselRows, rowByKey) {
         derivedStateOf {
             val activeKey = activeRowKey
             if (activeKey == null) {
@@ -449,7 +452,8 @@ fun ModernHomeContent(
             }
         }
     }
-    val clampedActiveItemIndex by remember(activeRow, activeItemIndex) {
+    // activeRow and activeItemIndex are both snapshot-observable — no remember keys needed.
+    val clampedActiveItemIndex by remember {
         derivedStateOf {
             activeRow?.let { row ->
                 activeItemIndex.coerceIn(0, (row.items.size - 1).coerceAtLeast(0))
@@ -466,7 +470,7 @@ fun ModernHomeContent(
         focusedItemByRow[row.key] = clampedIndex
     }
 
-    val activeHeroItemKey by remember(activeRow, clampedActiveItemIndex) {
+    val activeHeroItemKey by remember {
         derivedStateOf {
             val row = activeRow ?: return@derivedStateOf null
             row.items.getOrNull(clampedActiveItemIndex)?.key ?: row.items.firstOrNull()?.key
@@ -532,19 +536,21 @@ fun ModernHomeContent(
     ) {
         val rowHorizontalPadding = 52.dp
 
-        val resolvedHero by remember(heroItem, activeRow, clampedActiveItemIndex) {
+        val resolvedHero by remember {
             derivedStateOf {
                 heroItem
                     ?: activeRow?.items?.getOrNull(clampedActiveItemIndex)?.heroPreview
                     ?: activeRow?.items?.firstOrNull()?.heroPreview
             }
         }
-        val activeRowFallbackBackdrop = remember(activeRow?.key, activeRow?.items) {
-            activeRow?.items?.firstNotNullOfOrNull { item ->
-                item.heroPreview.backdrop?.takeIf { it.isNotBlank() }
+        val activeRowFallbackBackdrop by remember {
+            derivedStateOf {
+                activeRow?.items?.firstNotNullOfOrNull { item ->
+                    item.heroPreview.backdrop?.takeIf { it.isNotBlank() }
+                }
             }
         }
-        val heroBackdrop by remember(heroItem, resolvedHero, activeRowFallbackBackdrop) {
+        val heroBackdrop by remember {
             derivedStateOf {
                 firstNonBlank(
                     resolvedHero?.backdrop,
@@ -554,23 +560,21 @@ fun ModernHomeContent(
                 )
             }
         }
-        val expandedFocusedSelection by remember(focusedCatalogSelection, expandedCatalogFocusKey) {
+        val expandedFocusedSelection by remember {
             derivedStateOf {
                 focusedCatalogSelection?.takeIf { it.focusKey == expandedCatalogFocusKey }
             }
         }
-        val heroTrailerUrl by remember(expandedFocusedSelection, trailerPreviewUrls) {
+        // trailerPreviewUrls is a plain Map parameter — keep as remember key.
+        val heroTrailerUrl by remember(trailerPreviewUrls) {
             derivedStateOf {
                 expandedFocusedSelection?.payload?.itemId?.let { trailerPreviewUrls[it] }
             }
         }
         val expandedCatalogTrailerUrl = heroTrailerUrl
-        val shouldPlayHeroTrailer by remember(
-            effectiveAutoplayEnabled,
-            trailerPlaybackTarget,
-            heroTrailerUrl,
-            isVerticalRowsScrolling
-        ) {
+        // effectiveAutoplayEnabled and trailerPlaybackTarget are plain vals — keep as keys.
+        // heroTrailerUrl and isVerticalRowsScrolling are snapshot-observable — tracked automatically.
+        val shouldPlayHeroTrailer by remember(effectiveAutoplayEnabled, trailerPlaybackTarget) {
             derivedStateOf {
                 effectiveAutoplayEnabled &&
                     !isVerticalRowsScrolling &&
@@ -586,7 +590,7 @@ fun ModernHomeContent(
         }
         val heroTransitionProgress by animateFloatAsState(
             targetValue = if (shouldPlayHeroTrailer && heroTrailerFirstFrameRendered) 1f else 0f,
-            animationSpec = tween(durationMillis = 480),
+            animationSpec = HeroTransitionAnimSpec,
             label = "heroBackdropTrailerCrossfadeProgress"
         )
         val heroBackdropAlpha = 1f - heroTransitionProgress
@@ -664,7 +668,7 @@ fun ModernHomeContent(
                         val native = event.nativeKeyEvent
                         if (native.action == AndroidKeyEvent.ACTION_DOWN && native.repeatCount > 0) {
                             val now = System.currentTimeMillis()
-                            if (now - lastKeyRepeatTime < KEY_REPEAT_THROTTLE_MS) {
+                            if (now - lastKeyRepeatTime < uiState.keyRepeatThrottleMs) {
                                 return@onPreviewKeyEvent true
                             }
                             lastKeyRepeatTime = now

app/src/main/java/com/nuvio/tv/ui/screens/home/ModernHomeHero.kt

@@ -38,6 +38,8 @@ import coil.request.ImageRequest
 import com.nuvio.tv.ui.components.TrailerPlayer
 import com.nuvio.tv.ui.theme.NuvioColors
 
+private val HeroCrossfadeAnimSpec = tween<Float>(durationMillis = 200)
+
 @Composable
 internal fun ModernHeroMediaLayer(
     heroBackdrop: String?,
@@ -60,7 +62,7 @@ internal fun ModernHeroMediaLayer(
             modifier = Modifier
                 .fillMaxSize()
                 .graphicsLayer { alpha = heroBackdropAlpha },
-            animationSpec = tween(durationMillis = 350),
+            animationSpec = HeroCrossfadeAnimSpec,
             label = "modernHeroBackground"
         ) { imageUrl ->
             val imageModel = remember(localContext, imageUrl, requestWidthPx, requestHeightPx) {
@@ -94,31 +96,35 @@ internal fun ModernHeroMediaLayer(
             )
         }
 
+        // Pre-compute color variants outside drawWithCache to avoid per-frame allocations.
+        val bg096 = remember(bgColor) { bgColor.copy(alpha = 0.96f) }
+        val bg072 = remember(bgColor) { bgColor.copy(alpha = 0.72f) }
+        val bg078 = remember(bgColor) { bgColor.copy(alpha = 0.78f) }
+        val bg052 = remember(bgColor) { bgColor.copy(alpha = 0.52f) }
+        val bg016 = remember(bgColor) { bgColor.copy(alpha = 0.16f) }
+        val bg098 = remember(bgColor) { bgColor.copy(alpha = 0.98f) }
+
+        val horizontalGradientStops = remember(bg096, bg072) {
+            arrayOf(0.0f to bg096, 0.10f to bg072, 0.30f to Color.Transparent)
+        }
+        val radialGradientStops = remember(bg078, bg052, bg016) {
+            arrayOf(0.0f to bg078, 0.55f to bg052, 0.80f to bg016, 1.0f to Color.Transparent)
+        }
+        val verticalGradientStops = remember(bg072, bg098, bgColor) {
+            arrayOf(0.78f to Color.Transparent, 0.90f to bg072, 0.96f to bg098, 1.0f to bgColor)
+        }
+
         Box(
             modifier = Modifier
                 .fillMaxSize()
                 .drawWithCache {
-                    val horizontalGradient = Brush.horizontalGradient(
-                        0.0f to bgColor.copy(alpha = 0.96f),
-                        0.10f to bgColor.copy(alpha = 0.72f),
-                        0.30f to Color.Transparent
-                    )
+                    val horizontalGradient = Brush.horizontalGradient(colorStops = horizontalGradientStops)
                     val radialGradient = Brush.radialGradient(
-                        colorStops = arrayOf(
-                            0.0f to bgColor.copy(alpha = 0.78f),
-                            0.55f to bgColor.copy(alpha = 0.52f),
-                            0.80f to bgColor.copy(alpha = 0.16f),
-                            1.0f to Color.Transparent
-                        ),
+                        colorStops = radialGradientStops,
                         center = Offset(0f, size.height / 2f),
                         radius = size.height
                     )
-                    val verticalGradient = Brush.verticalGradient(
-                        0.78f to Color.Transparent,
-                        0.90f to bgColor.copy(alpha = 0.72f),
-                        0.96f to bgColor.copy(alpha = 0.98f),
-                        1.0f to bgColor
-                    )
+                    val verticalGradient = Brush.verticalGradient(colorStops = verticalGradientStops)
                     onDrawBehind {
                         drawRect(brush = horizontalGradient, size = size)
                         drawRect(brush = radialGradient, size = size)
@@ -292,10 +298,11 @@ internal fun HeroTitleBlock(
 
 @Composable
 private fun HeroMetaDivider(scale: Float) {
+    val dividerColor = remember { NuvioColors.TextTertiary.copy(alpha = 0.78f) }
     Box(
         modifier = Modifier
             .size((4.dp * scale).coerceAtLeast(2.dp))
             .clip(RoundedCornerShape(percent = 50))
-            .background(NuvioColors.TextTertiary.copy(alpha = 0.78f))
+            .background(dividerColor)
     )
 }

app/src/main/java/com/nuvio/tv/ui/screens/home/ModernHomeModels.kt

@@ -14,7 +14,7 @@ internal val YEAR_REGEX = Regex("""\b(19|20)\d{2}\b""")
 internal const val MODERN_HERO_TEXT_WIDTH_FRACTION = 0.42f
 internal const val MODERN_HERO_BACKDROP_HEIGHT_FRACTION = 0.62f
 internal const val MODERN_TRAILER_OVERSCAN_ZOOM = 1.35f
-internal const val MODERN_HERO_FOCUS_DEBOUNCE_MS = 90L
+internal const val MODERN_HERO_FOCUS_DEBOUNCE_MS = 180L
 internal val MODERN_ROW_HEADER_FOCUS_INSET = 56.dp
 internal val MODERN_LANDSCAPE_LOGO_GRADIENT = Brush.verticalGradient(
     colorStops = arrayOf(

app/src/main/java/com/nuvio/tv/ui/screens/home/ModernHomeRows.kt

@@ -27,7 +27,6 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -79,6 +78,8 @@ import com.nuvio.tv.ui.theme.NuvioColors
 import kotlin.math.abs
 import kotlinx.coroutines.flow.distinctUntilChanged
 
+private val CardWatchedIconAnimSpec = tween<Dp>(durationMillis = 180)
+
 @OptIn(ExperimentalComposeUiApi::class)
 @Composable
 private fun ModernContinueWatchingRowItem(
@@ -229,10 +230,15 @@ internal fun ModernRowSection(
     val rowListStates = uiCaches.rowListStates
     val loadMoreRequestedTotals = uiCaches.loadMoreRequestedTotals
 
+    val titleMedium = MaterialTheme.typography.titleMedium
+    val rowTitleStyle = remember(titleMedium) {
+        titleMedium.copy(fontWeight = FontWeight.SemiBold)
+    }
+
     Column {
         Text(
             text = row.title,
-            style = MaterialTheme.typography.titleMedium.copy(fontWeight = FontWeight.SemiBold),
+            style = rowTitleStyle,
             color = NuvioColors.TextPrimary,
             modifier = Modifier.padding(start = 52.dp, bottom = rowTitleBottom)
         )
@@ -242,9 +248,6 @@ internal fun ModernRowSection(
                 firstVisibleItemIndex = focusStateCatalogRowScrollStates[row.key] ?: 0
             )
         }
-        val isRowScrolling by remember(rowListState) {
-            derivedStateOf { rowListState.isScrollInProgress }
-        }
         val currentRowState = rememberUpdatedState(row)
         val loadMoreCatalogId = row.catalogId
         val loadMoreAddonId = row.addonId
@@ -375,9 +378,12 @@ internal fun ModernRowSection(
                     } else {
                         fallbackIndex
                     }
-                    val visibleIndices = rowListState.layoutInfo.visibleItemsInfo.map { it.index }.toSet()
-                    val safeIndex = if (restoreIndex in visibleIndices) restoreIndex else
-                        visibleIndices.minByOrNull { kotlin.math.abs(it - restoreIndex) } ?: fallbackIndex
+                    val visibleItems = rowListState.layoutInfo.visibleItemsInfo
+                    val safeIndex = if (visibleItems.any { it.index == restoreIndex }) {
+                        restoreIndex
+                    } else {
+                        visibleItems.minByOrNull { kotlin.math.abs(it.index - restoreIndex) }?.index ?: fallbackIndex
+                    }
                     val itemKey = row.items.getOrNull(safeIndex)?.key ?: row.items.first().key
                     itemFocusRequesters[row.key]?.get(itemKey) ?: FocusRequester.Default
                 },
@@ -424,8 +430,8 @@ internal fun ModernRowSection(
                                 modernCatalogCardWidth = modernCatalogCardWidth,
                                 modernCatalogCardHeight = modernCatalogCardHeight,
                                 focusedPosterBackdropTrailerMuted = focusedPosterBackdropTrailerMuted,
-                                effectiveExpandEnabled = effectiveExpandEnabled && !isRowScrolling,
-                                effectiveAutoplayEnabled = effectiveAutoplayEnabled && !isRowScrolling,
+                                effectiveExpandEnabled = effectiveExpandEnabled,
+                                effectiveAutoplayEnabled = effectiveAutoplayEnabled,
                                 trailerPlaybackTarget = trailerPlaybackTarget,
                                 expandedCatalogFocusKey = expandedCatalogFocusKey,
                                 expandedTrailerPreviewUrl = expandedTrailerPreviewUrl,
@@ -473,7 +479,7 @@ private fun ModernCarouselCard(
     onBackdropInteraction: () -> Unit,
     onTrailerEnded: () -> Unit
 ) {
-    val cardShape = RoundedCornerShape(cardCornerRadius)
+    val cardShape = remember(cardCornerRadius) { RoundedCornerShape(cardCornerRadius) }
     val context = LocalContext.current
     val density = LocalDensity.current
     val expandedCardWidth = cardHeight * (16f / 9f)
@@ -538,11 +544,16 @@ private fun ModernCarouselCard(
     val hasLandscapeLogo = useLandscapePosters && !item.heroPreview.logo.isNullOrBlank()
     var isFocused by remember { mutableStateOf(false) }
     var longPressTriggered by remember { mutableStateOf(false) }
-    val watchedIconEndPadding by animateDpAsState(
-        targetValue = if (isFocused) 16.dp else 8.dp,
-        animationSpec = tween(durationMillis = 180),
-        label = "modernCardWatchedIconEndPadding"
-    )
+    val watchedIconEndPadding = if (isWatched) {
+        val padding by animateDpAsState(
+            targetValue = if (isFocused) 16.dp else 8.dp,
+            animationSpec = CardWatchedIconAnimSpec,
+            label = "modernCardWatchedIconEndPadding"
+        )
+        padding
+    } else {
+        8.dp
+    }
     val backgroundCardColor = NuvioColors.BackgroundCard
     val focusRingColor = NuvioColors.FocusRing
     val titleMedium = MaterialTheme.typography.titleMedium
@@ -552,6 +563,8 @@ private fun ModernCarouselCard(
             shape = cardShape
         )
     }
+    val cardShapeSpec = remember(cardShape) { CardDefaults.shape(shape = cardShape) }
+    val cardScale = remember { CardDefaults.scale(focusedScale = 1f) }
     val titleStyle = remember(titleMedium) {
         titleMedium.copy(fontWeight = FontWeight.Medium)
     }
@@ -604,7 +617,7 @@ private fun ModernCarouselCard(
                     }
                     false
                 },
-            shape = CardDefaults.shape(shape = cardShape),
+            shape = cardShapeSpec,
             colors = CardDefaults.colors(
                 containerColor = backgroundCardColor,
                 focusedContainerColor = backgroundCardColor
@@ -612,20 +625,22 @@ private fun ModernCarouselCard(
             border = CardDefaults.border(
                 focusedBorder = focusedBorder
             ),
-            scale = CardDefaults.scale(focusedScale = 1f)
+            scale = cardScale
         ) {
             Box(modifier = Modifier.fillMaxSize()) {
-                val mediaLayerModifier = if (hasLandscapeLogo) {
-                    Modifier
-                        .fillMaxSize()
-                        .drawWithCache {
-                            onDrawWithContent {
-                                drawContent()
-                                drawRect(brush = MODERN_LANDSCAPE_LOGO_GRADIENT, size = size)
+                val mediaLayerModifier = remember(hasLandscapeLogo) {
+                    if (hasLandscapeLogo) {
+                        Modifier
+                            .fillMaxSize()
+                            .drawWithCache {
+                                onDrawWithContent {
+                                    drawContent()
+                                    drawRect(brush = MODERN_LANDSCAPE_LOGO_GRADIENT, size = size)
+                                }
                             }
-                        }
-                } else {
-                    Modifier.fillMaxSize()
+                    } else {
+                        Modifier.fillMaxSize()
+                    }
                 }
 
                 Box(modifier = mediaLayerModifier) {

app/src/main/java/com/nuvio/tv/ui/screens/settings/DebugSettingsScreen.kt

@@ -87,6 +87,25 @@ fun DebugSettingsContent(
                 )
             }
 
+            // ── Performance ──
+            item(key = "debug_performance_header") {
+                Spacer(modifier = Modifier.height(8.dp))
+                Text(
+                    text = "Performance",
+                    style = MaterialTheme.typography.titleSmall,
+                    color = NuvioColors.TextTertiary,
+                    modifier = Modifier.padding(bottom = 4.dp)
+                )
+            }
+
+            item(key = "debug_device_tier") {
+                DebugDeviceTierSelector(
+                    currentOverride = uiState.deviceTierOverride,
+                    detectedTier = uiState.detectedDeviceTier,
+                    onSelect = { viewModel.onEvent(DebugSettingsEvent.SetDeviceTierOverride(it)) }
+                )
+            }
+
             // ── Feature Toggles ──
             item(key = "debug_feature_toggles_header") {
                 Spacer(modifier = Modifier.height(8.dp))
@@ -291,6 +310,66 @@ private fun DebugDialogButton(
     }
 }
 
+@Composable
+private fun DebugDeviceTierSelector(
+    currentOverride: String,
+    detectedTier: String,
+    onSelect: (String) -> Unit
+) {
+    val options = listOf("auto", "low", "medium", "high")
+
+    Card(
+        onClick = {
+            val currentIndex = options.indexOf(currentOverride)
+            val nextIndex = (currentIndex + 1) % options.size
+            onSelect(options[nextIndex])
+        },
+        modifier = Modifier.fillMaxWidth(),
+        colors = CardDefaults.colors(
+            containerColor = NuvioColors.BackgroundCard,
+            focusedContainerColor = NuvioColors.FocusBackground
+        ),
+        border = CardDefaults.border(
+            focusedBorder = Border(
+                border = BorderStroke(2.dp, NuvioColors.FocusRing),
+                shape = RoundedCornerShape(12.dp)
+            )
+        ),
+        shape = CardDefaults.shape(RoundedCornerShape(12.dp)),
+        scale = CardDefaults.scale(focusedScale = 1.02f)
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(20.dp),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = "Device Performance Tier",
+                    style = MaterialTheme.typography.titleMedium,
+                    color = NuvioColors.TextPrimary
+                )
+                Spacer(modifier = Modifier.height(4.dp))
+                Text(
+                    text = "Detected: $detectedTier. Click to cycle override.",
+                    style = MaterialTheme.typography.bodySmall,
+                    color = NuvioColors.TextSecondary
+                )
+            }
+
+            Spacer(modifier = Modifier.width(12.dp))
+
+            Text(
+                text = currentOverride.uppercase(),
+                style = MaterialTheme.typography.titleMedium,
+                color = NuvioColors.Secondary
+            )
+        }
+    }
+}
+
 @Composable
 private fun DebugSignInCard(
     isLoading: Boolean,

app/src/main/java/com/nuvio/tv/ui/screens/settings/DebugSettingsViewModel.kt

@@ -3,6 +3,8 @@ package com.nuvio.tv.ui.screens.settings
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.nuvio.tv.core.auth.AuthManager
+import com.nuvio.tv.core.device.DeviceCapabilities
+import com.nuvio.tv.core.device.DeviceTier
 import com.nuvio.tv.data.local.DebugSettingsDataStore
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -16,7 +18,8 @@ import javax.inject.Inject
 @HiltViewModel
 class DebugSettingsViewModel @Inject constructor(
     private val dataStore: DebugSettingsDataStore,
-    private val authManager: AuthManager
+    private val authManager: AuthManager,
+    private val deviceCapabilities: DeviceCapabilities
 ) : ViewModel() {
 
     private val _uiState = MutableStateFlow(DebugSettingsUiState())
@@ -33,6 +36,23 @@ class DebugSettingsViewModel @Inject constructor(
                 _uiState.update { it.copy(syncCodeFeaturesEnabled = enabled) }
             }
         }
+        viewModelScope.launch {
+            dataStore.deviceTierOverride.collectLatest { override ->
+                val tier = when (override) {
+                    "low" -> DeviceTier.LOW
+                    "medium" -> DeviceTier.MEDIUM
+                    "high" -> DeviceTier.HIGH
+                    else -> null
+                }
+                deviceCapabilities.setTierOverride(tier)
+                _uiState.update {
+                    it.copy(
+                        deviceTierOverride = override,
+                        detectedDeviceTier = deviceCapabilities.tier.name
+                    )
+                }
+            }
+        }
     }
 
     fun onEvent(event: DebugSettingsEvent) {
@@ -43,6 +63,9 @@ class DebugSettingsViewModel @Inject constructor(
             is DebugSettingsEvent.ToggleSyncCodeFeatures -> {
                 viewModelScope.launch { dataStore.setSyncCodeFeaturesEnabled(event.enabled) }
             }
+            is DebugSettingsEvent.SetDeviceTierOverride -> {
+                viewModelScope.launch { dataStore.setDeviceTierOverride(event.value) }
+            }
             is DebugSettingsEvent.SignIn -> {
                 viewModelScope.launch {
                     _uiState.update { it.copy(signInLoading = true, signInResult = null) }
@@ -63,11 +86,14 @@ data class DebugSettingsUiState(
     val accountTabEnabled: Boolean = false,
     val syncCodeFeaturesEnabled: Boolean = false,
     val signInLoading: Boolean = false,
-    val signInResult: String? = null
+    val signInResult: String? = null,
+    val deviceTierOverride: String = "auto",
+    val detectedDeviceTier: String = "HIGH"
 )
 
 sealed class DebugSettingsEvent {
     data class ToggleAccountTab(val enabled: Boolean) : DebugSettingsEvent()
     data class ToggleSyncCodeFeatures(val enabled: Boolean) : DebugSettingsEvent()
+    data class SetDeviceTierOverride(val value: String) : DebugSettingsEvent()
     data class SignIn(val email: String, val password: String) : DebugSettingsEvent()
 }

compose_stability_config.conf

@@ -6,10 +6,31 @@
 com.nuvio.tv.domain.model.*
 
 // UI state classes
+com.nuvio.tv.ui.screens.home.HomeUiState
+com.nuvio.tv.ui.screens.home.HomeScreenFocusState
+com.nuvio.tv.ui.screens.home.ContinueWatchingItem
+com.nuvio.tv.ui.screens.home.ContinueWatchingItem.InProgress
+com.nuvio.tv.ui.screens.home.ContinueWatchingItem.NextUp
+com.nuvio.tv.ui.screens.home.NextUpInfo
+com.nuvio.tv.ui.screens.home.GridItem
+com.nuvio.tv.ui.screens.home.GridItem.Hero
+com.nuvio.tv.ui.screens.home.GridItem.SectionDivider
+com.nuvio.tv.ui.screens.home.GridItem.Content
+com.nuvio.tv.ui.screens.home.GridItem.SeeAll
 com.nuvio.tv.ui.screens.search.SearchUiState
 com.nuvio.tv.ui.screens.search.DiscoverCatalog
 com.nuvio.tv.ui.components.PosterCardStyle
 
+// Modern home screen types
+com.nuvio.tv.ui.screens.home.HeroPreview
+com.nuvio.tv.ui.screens.home.HeroCarouselRow
+com.nuvio.tv.ui.screens.home.ModernCarouselItem
+com.nuvio.tv.ui.screens.home.ModernPayload
+com.nuvio.tv.ui.screens.home.ModernPayload.Catalog
+com.nuvio.tv.ui.screens.home.ModernPayload.ContinueWatching
+com.nuvio.tv.ui.screens.home.FocusedCatalogSelection
+com.nuvio.tv.ui.screens.home.CarouselRowLookups
+
 // Collections from kotlinx
 kotlin.collections.List
 kotlin.collections.Map

gradle.properties

@@ -6,7 +6,7 @@
 # http://www.gradle.org/docs/current/userguide/build_environment.html
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
-org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+org.gradle.jvmargs=-Xmx4096m -Dfile.encoding=UTF-8
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. For more details, visit
 # https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects

settings.gradle.kts

@@ -21,5 +21,5 @@ dependencyResolutionManagement {
 
 rootProject.name = "My Application"
 include(":app")
-// include(":benchmark")  // TODO: create when ready
+include(":benchmark")