diff --git a/core/java/android/app/ResourcesManager.java b/core/java/android/app/ResourcesManager.java
index 24a5157..6255260 100644
--- a/core/java/android/app/ResourcesManager.java
+++ b/core/java/android/app/ResourcesManager.java
@@ -550,7 +550,7 @@
     @UnsupportedAppUsage
     protected @Nullable AssetManager createAssetManager(@NonNull final ResourcesKey key,
             @Nullable ApkAssetsSupplier apkSupplier) {
-        final AssetManager.Builder builder = new AssetManager.Builder();
+        final AssetManager.Builder builder = new AssetManager.Builder().setNoInit();
 
         final ArrayList<ApkKey> apkKeys = extractApkKeys(key);
         for (int i = 0, n = apkKeys.size(); i < n; i++) {
@@ -1555,7 +1555,7 @@
         } else if(overlayPaths == null) {
             return ArrayUtils.cloneOrNull(resourceDirs);
         } else {
-            final ArrayList<String> paths = new ArrayList<>();
+            final var paths = new ArrayList<String>(overlayPaths.length + resourceDirs.length);
             for (final String path : overlayPaths) {
                 paths.add(path);
             }
diff --git a/core/java/android/content/res/AssetManager.java b/core/java/android/content/res/AssetManager.java
index 23b9d0b..d259e97 100644
--- a/core/java/android/content/res/AssetManager.java
+++ b/core/java/android/content/res/AssetManager.java
@@ -137,6 +137,8 @@
         private ArrayList<ApkAssets> mUserApkAssets = new ArrayList<>();
         private ArrayList<ResourcesLoader> mLoaders = new ArrayList<>();
 
+        private boolean mNoInit = false;
+
         public Builder addApkAssets(ApkAssets apkAssets) {
             mUserApkAssets.add(apkAssets);
             return this;
@@ -147,6 +149,11 @@
             return this;
         }
 
+        public Builder setNoInit() {
+            mNoInit = true;
+            return this;
+        }
+
         public AssetManager build() {
             // Retrieving the system ApkAssets forces their creation as well.
             final ApkAssets[] systemApkAssets = getSystem().getApkAssets();
@@ -188,7 +195,7 @@
             final AssetManager assetManager = new AssetManager(false /*sentinel*/);
             assetManager.mApkAssets = apkAssets;
             AssetManager.nativeSetApkAssets(assetManager.mObject, apkAssets,
-                    false /*invalidateCaches*/);
+                    false /*invalidateCaches*/, mNoInit /*preset*/);
             assetManager.mLoaders = mLoaders.isEmpty() ? null
                     : mLoaders.toArray(new ResourcesLoader[0]);
 
@@ -329,7 +336,7 @@
         synchronized (this) {
             ensureOpenLocked();
             mApkAssets = newApkAssets;
-            nativeSetApkAssets(mObject, mApkAssets, invalidateCaches);
+            nativeSetApkAssets(mObject, mApkAssets, invalidateCaches, false);
             if (invalidateCaches) {
                 // Invalidate all caches.
                 invalidateCachesLocked(-1);
@@ -496,7 +503,7 @@
 
             mApkAssets = Arrays.copyOf(mApkAssets, count + 1);
             mApkAssets[count] = assets;
-            nativeSetApkAssets(mObject, mApkAssets, true);
+            nativeSetApkAssets(mObject, mApkAssets, true, false);
             invalidateCachesLocked(-1);
             return count + 1;
         }
@@ -1503,12 +1510,29 @@
             int navigation, int screenWidth, int screenHeight, int smallestScreenWidthDp,
             int screenWidthDp, int screenHeightDp, int screenLayout, int uiMode, int colorMode,
             int grammaticalGender, int majorVersion) {
+        setConfigurationInternal(mcc, mnc, defaultLocale, locales, orientation,
+                touchscreen, density, keyboard, keyboardHidden, navigation, screenWidth,
+                screenHeight, smallestScreenWidthDp, screenWidthDp, screenHeightDp,
+                screenLayout, uiMode, colorMode, grammaticalGender, majorVersion, false);
+    }
+
+    /**
+     * Change the configuration used when retrieving resources, and potentially force a refresh of
+     * the state.  Not for use by applications.
+     * @hide
+     */
+    void setConfigurationInternal(int mcc, int mnc, String defaultLocale, String[] locales,
+            int orientation, int touchscreen, int density, int keyboard, int keyboardHidden,
+            int navigation, int screenWidth, int screenHeight, int smallestScreenWidthDp,
+            int screenWidthDp, int screenHeightDp, int screenLayout, int uiMode, int colorMode,
+            int grammaticalGender, int majorVersion, boolean forceRefresh) {
         synchronized (this) {
             ensureValidLocked();
             nativeSetConfiguration(mObject, mcc, mnc, defaultLocale, locales, orientation,
                     touchscreen, density, keyboard, keyboardHidden, navigation, screenWidth,
                     screenHeight, smallestScreenWidthDp, screenWidthDp, screenHeightDp,
-                    screenLayout, uiMode, colorMode, grammaticalGender, majorVersion);
+                    screenLayout, uiMode, colorMode, grammaticalGender, majorVersion,
+                    forceRefresh);
         }
     }
 
@@ -1593,13 +1617,13 @@
     private static native long nativeCreate();
     private static native void nativeDestroy(long ptr);
     private static native void nativeSetApkAssets(long ptr, @NonNull ApkAssets[] apkAssets,
-            boolean invalidateCaches);
+            boolean invalidateCaches, boolean preset);
     private static native void nativeSetConfiguration(long ptr, int mcc, int mnc,
             @Nullable String defaultLocale, @NonNull String[] locales, int orientation,
             int touchscreen, int density, int keyboard, int keyboardHidden, int navigation,
             int screenWidth, int screenHeight, int smallestScreenWidthDp, int screenWidthDp,
             int screenHeightDp, int screenLayout, int uiMode, int colorMode, int grammaticalGender,
-            int majorVersion);
+            int majorVersion, boolean forceRefresh);
     private static native @NonNull SparseArray<String> nativeGetAssignedPackageIdentifiers(
             long ptr, boolean includeOverlays, boolean includeLoaders);
 
diff --git a/core/java/android/content/res/ResourcesImpl.java b/core/java/android/content/res/ResourcesImpl.java
index 5e442b8..079c2c1 100644
--- a/core/java/android/content/res/ResourcesImpl.java
+++ b/core/java/android/content/res/ResourcesImpl.java
@@ -200,7 +200,7 @@
         mMetrics.setToDefaults();
         mDisplayAdjustments = displayAdjustments;
         mConfiguration.setToDefaults();
-        updateConfiguration(config, metrics, displayAdjustments.getCompatibilityInfo());
+        updateConfigurationImpl(config, metrics, displayAdjustments.getCompatibilityInfo(), true);
     }
 
     public DisplayAdjustments getDisplayAdjustments() {
@@ -402,7 +402,12 @@
     }
 
     public void updateConfiguration(Configuration config, DisplayMetrics metrics,
-                                    CompatibilityInfo compat) {
+            CompatibilityInfo compat) {
+        updateConfigurationImpl(config, metrics, compat, false);
+    }
+
+    private void updateConfigurationImpl(Configuration config, DisplayMetrics metrics,
+                                    CompatibilityInfo compat, boolean forceAssetsRefresh) {
         Trace.traceBegin(Trace.TRACE_TAG_RESOURCES, "ResourcesImpl#updateConfiguration");
         try {
             synchronized (mAccessLock) {
@@ -528,7 +533,7 @@
                     keyboardHidden = mConfiguration.keyboardHidden;
                 }
 
-                mAssets.setConfiguration(mConfiguration.mcc, mConfiguration.mnc,
+                mAssets.setConfigurationInternal(mConfiguration.mcc, mConfiguration.mnc,
                         defaultLocale,
                         selectedLocales,
                         mConfiguration.orientation,
@@ -539,7 +544,7 @@
                         mConfiguration.screenWidthDp, mConfiguration.screenHeightDp,
                         mConfiguration.screenLayout, mConfiguration.uiMode,
                         mConfiguration.colorMode, mConfiguration.getGrammaticalGender(),
-                        Build.VERSION.RESOURCES_SDK_INT);
+                        Build.VERSION.RESOURCES_SDK_INT, forceAssetsRefresh);
 
                 if (DEBUG_CONFIG) {
                     Slog.i(TAG, "**** Updating config of " + this + ": final config is "
diff --git a/core/jni/android_util_AssetManager.cpp b/core/jni/android_util_AssetManager.cpp
index 3ee15ab..3d0ab4e 100644
--- a/core/jni/android_util_AssetManager.cpp
+++ b/core/jni/android_util_AssetManager.cpp
@@ -314,7 +314,8 @@
 }
 
 static void NativeSetApkAssets(JNIEnv* env, jclass /*clazz*/, jlong ptr,
-                               jobjectArray apk_assets_array, jboolean invalidate_caches) {
+                               jobjectArray apk_assets_array, jboolean invalidate_caches,
+                               jboolean preset) {
   ATRACE_NAME("AssetManager::SetApkAssets");
 
   const jsize apk_assets_len = env->GetArrayLength(apk_assets_array);
@@ -343,7 +344,11 @@
   }
 
   auto assetmanager = LockAndStartAssetManager(ptr);
-  assetmanager->SetApkAssets(apk_assets, invalidate_caches);
+  if (preset) {
+    assetmanager->PresetApkAssets(apk_assets);
+  } else {
+    assetmanager->SetApkAssets(apk_assets, invalidate_caches);
+  }
 }
 
 static void NativeSetConfiguration(JNIEnv* env, jclass /*clazz*/, jlong ptr, jint mcc, jint mnc,
@@ -353,7 +358,7 @@
                                    jint screen_height, jint smallest_screen_width_dp,
                                    jint screen_width_dp, jint screen_height_dp, jint screen_layout,
                                    jint ui_mode, jint color_mode, jint grammatical_gender,
-                                   jint major_version) {
+                                   jint major_version, jboolean force_refresh) {
   ATRACE_NAME("AssetManager::SetConfiguration");
 
   const jsize locale_count = (locales == NULL) ? 0 : env->GetArrayLength(locales);
@@ -413,7 +418,7 @@
   }
 
   auto assetmanager = LockAndStartAssetManager(ptr);
-  assetmanager->SetConfigurations(configs);
+  assetmanager->SetConfigurations(std::move(configs), force_refresh != JNI_FALSE);
   assetmanager->SetDefaultLocale(default_locale_int);
 }
 
@@ -1522,8 +1527,8 @@
         // AssetManager setup methods.
         {"nativeCreate", "()J", (void*)NativeCreate},
         {"nativeDestroy", "(J)V", (void*)NativeDestroy},
-        {"nativeSetApkAssets", "(J[Landroid/content/res/ApkAssets;Z)V", (void*)NativeSetApkAssets},
-        {"nativeSetConfiguration", "(JIILjava/lang/String;[Ljava/lang/String;IIIIIIIIIIIIIIII)V",
+        {"nativeSetApkAssets", "(J[Landroid/content/res/ApkAssets;ZZ)V", (void*)NativeSetApkAssets},
+        {"nativeSetConfiguration", "(JIILjava/lang/String;[Ljava/lang/String;IIIIIIIIIIIIIIIIZ)V",
          (void*)NativeSetConfiguration},
         {"nativeGetAssignedPackageIdentifiers", "(JZZ)Landroid/util/SparseArray;",
          (void*)NativeGetAssignedPackageIdentifiers},
diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index 8748dab..46f636e 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -117,6 +117,10 @@
   return true;
 }
 
+void AssetManager2::PresetApkAssets(ApkAssetsList apk_assets) {
+  BuildDynamicRefTable(apk_assets);
+}
+
 bool AssetManager2::SetApkAssets(std::initializer_list<ApkAssetsPtr> apk_assets,
                                  bool invalidate_caches) {
   return SetApkAssets(ApkAssetsList(apk_assets.begin(), apk_assets.size()), invalidate_caches);
@@ -432,13 +436,18 @@
   return false;
 }
 
-void AssetManager2::SetConfigurations(std::vector<ResTable_config> configurations) {
+void AssetManager2::SetConfigurations(std::vector<ResTable_config> configurations,
+    bool force_refresh) {
   int diff = 0;
-  if (configurations_.size() != configurations.size()) {
+  if (force_refresh) {
     diff = -1;
   } else {
-    for (int i = 0; i < configurations_.size(); i++) {
-      diff |= configurations_[i].diff(configurations[i]);
+    if (configurations_.size() != configurations.size()) {
+      diff = -1;
+    } else {
+      for (int i = 0; i < configurations_.size(); i++) {
+        diff |= configurations_[i].diff(configurations[i]);
+      }
     }
   }
   configurations_ = std::move(configurations);
@@ -775,8 +784,7 @@
     bool has_locale = false;
     if (result->config.locale == 0) {
       if (default_locale_ != 0) {
-        ResTable_config conf;
-        conf.locale = default_locale_;
+        ResTable_config conf = {.locale = default_locale_};
         // Since we know conf has a locale and only a locale, match will tell us if that locale
         // matches
         has_locale = conf.match(config);
diff --git a/libs/androidfw/include/androidfw/AssetManager2.h b/libs/androidfw/include/androidfw/AssetManager2.h
index d9ff35b..17a8ba6 100644
--- a/libs/androidfw/include/androidfw/AssetManager2.h
+++ b/libs/androidfw/include/androidfw/AssetManager2.h
@@ -124,6 +124,9 @@
   // new resource IDs.
   bool SetApkAssets(ApkAssetsList apk_assets, bool invalidate_caches = true);
   bool SetApkAssets(std::initializer_list<ApkAssetsPtr> apk_assets, bool invalidate_caches = true);
+  // This one is an optimization - it skips all calculations for applying the currently set
+  // configuration, expecting a configuration update later with a forced refresh.
+  void PresetApkAssets(ApkAssetsList apk_assets);
 
   const ApkAssetsPtr& GetApkAssets(ApkAssetsCookie cookie) const;
   int GetApkAssetsCount() const {
@@ -156,7 +159,7 @@
 
   // Sets/resets the configuration for this AssetManager. This will cause all
   // caches that are related to the configuration change to be invalidated.
-  void SetConfigurations(std::vector<ResTable_config> configurations);
+  void SetConfigurations(std::vector<ResTable_config> configurations, bool force_refresh = false);
 
   inline const std::vector<ResTable_config>& GetConfigurations() const {
     return configurations_;