diff --git a/core/java/android/app/WindowConfiguration.java b/core/java/android/app/WindowConfiguration.java
index 4ae1670e90412..d04ca1d9a48e7 100644
--- a/core/java/android/app/WindowConfiguration.java
+++ b/core/java/android/app/WindowConfiguration.java
@@ -57,7 +57,7 @@ public class WindowConfiguration implements Parcelable, Comparable<WindowConfigu
      * TODO: Investigate combining with {@link #mAppBounds}. Can the latter be a product of the
      * former?
      */
-    private Rect mBounds = new Rect();
+    private final Rect mBounds = new Rect();
 
     /**
      * {@link android.graphics.Rect} defining app bounds. The dimensions override usages of
@@ -71,7 +71,7 @@ public class WindowConfiguration implements Parcelable, Comparable<WindowConfigu
      * The maximum {@link Rect} bounds that an app can expect. It is used to report value of
      * {@link WindowManager#getMaximumWindowMetrics()}.
      */
-    private Rect mMaxBounds = new Rect();
+    private final Rect mMaxBounds = new Rect();
 
     /**
      * The current rotation of this window container relative to the default
@@ -240,9 +240,9 @@ public class WindowConfiguration implements Parcelable, Comparable<WindowConfigu
 
     @Override
     public void writeToParcel(Parcel dest, int flags) {
-        dest.writeParcelable(mBounds, flags);
-        dest.writeParcelable(mAppBounds, flags);
-        dest.writeParcelable(mMaxBounds, flags);
+        mBounds.writeToParcel(dest, flags);
+        dest.writeTypedObject(mAppBounds, flags);
+        mMaxBounds.writeToParcel(dest, flags);
         dest.writeInt(mWindowingMode);
         dest.writeInt(mActivityType);
         dest.writeInt(mAlwaysOnTop);
@@ -250,10 +250,11 @@ public class WindowConfiguration implements Parcelable, Comparable<WindowConfigu
         dest.writeInt(mDisplayWindowingMode);
     }
 
-    private void readFromParcel(Parcel source) {
-        mBounds = source.readParcelable(Rect.class.getClassLoader());
-        mAppBounds = source.readParcelable(Rect.class.getClassLoader());
-        mMaxBounds = source.readParcelable(Rect.class.getClassLoader());
+    /** @hide */
+    public void readFromParcel(@NonNull Parcel source) {
+        mBounds.readFromParcel(source);
+        mAppBounds = source.readTypedObject(Rect.CREATOR);
+        mMaxBounds.readFromParcel(source);
         mWindowingMode = source.readInt();
         mActivityType = source.readInt();
         mAlwaysOnTop = source.readInt();
@@ -693,9 +694,7 @@ public class WindowConfiguration implements Parcelable, Comparable<WindowConfigu
         }
         protoOutputStream.write(WINDOWING_MODE, mWindowingMode);
         protoOutputStream.write(ACTIVITY_TYPE, mActivityType);
-        if (mBounds != null) {
-            mBounds.dumpDebug(protoOutputStream, BOUNDS);
-        }
+        mBounds.dumpDebug(protoOutputStream, BOUNDS);
         mMaxBounds.dumpDebug(protoOutputStream, MAX_BOUNDS);
         protoOutputStream.end(token);
     }
@@ -719,11 +718,9 @@ public class WindowConfiguration implements Parcelable, Comparable<WindowConfigu
                         mAppBounds.readFromProto(proto, APP_BOUNDS);
                         break;
                     case (int) BOUNDS:
-                        mBounds = new Rect();
                         mBounds.readFromProto(proto, BOUNDS);
                         break;
                     case (int) MAX_BOUNDS:
-                        mMaxBounds = new Rect();
                         mMaxBounds.readFromProto(proto, MAX_BOUNDS);
                         break;
                     case (int) WINDOWING_MODE:
diff --git a/core/java/android/content/res/Configuration.java b/core/java/android/content/res/Configuration.java
index 2f7aeb80986bc..b66f048b829db 100644
--- a/core/java/android/content/res/Configuration.java
+++ b/core/java/android/content/res/Configuration.java
@@ -1956,7 +1956,7 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         dest.writeInt(mnc);
 
         fixUpLocaleList();
-        dest.writeParcelable(mLocaleList, flags);
+        dest.writeTypedObject(mLocaleList, flags);
 
         if(userSetLocale) {
             dest.writeInt(1);
@@ -1980,7 +1980,7 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         dest.writeInt(compatScreenWidthDp);
         dest.writeInt(compatScreenHeightDp);
         dest.writeInt(compatSmallestScreenWidthDp);
-        dest.writeValue(windowConfiguration);
+        windowConfiguration.writeToParcel(dest, flags);
         dest.writeInt(assetsSeq);
         dest.writeInt(seq);
         dest.writeInt(fontWeightAdjustment);
@@ -1991,7 +1991,7 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         mcc = source.readInt();
         mnc = source.readInt();
 
-        mLocaleList = source.readParcelable(LocaleList.class.getClassLoader());
+        mLocaleList = source.readTypedObject(LocaleList.CREATOR);
         locale = mLocaleList.get(0);
 
         userSetLocale = (source.readInt()==1);
@@ -2012,7 +2012,7 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         compatScreenWidthDp = source.readInt();
         compatScreenHeightDp = source.readInt();
         compatSmallestScreenWidthDp = source.readInt();
-        windowConfiguration.setTo((WindowConfiguration) source.readValue(null));
+        windowConfiguration.readFromParcel(source);
         assetsSeq = source.readInt();
         seq = source.readInt();
         fontWeightAdjustment = source.readInt();
diff --git a/core/java/android/util/MergedConfiguration.java b/core/java/android/util/MergedConfiguration.java
index 3ac44aacc2c73..4328e0826bd0b 100644
--- a/core/java/android/util/MergedConfiguration.java
+++ b/core/java/android/util/MergedConfiguration.java
@@ -33,9 +33,9 @@ import java.io.PrintWriter;
  */
 public class MergedConfiguration implements Parcelable {
 
-    private Configuration mGlobalConfig = new Configuration();
-    private Configuration mOverrideConfig = new Configuration();
-    private Configuration mMergedConfig = new Configuration();
+    private final Configuration mGlobalConfig = new Configuration();
+    private final Configuration mOverrideConfig = new Configuration();
+    private final Configuration mMergedConfig = new Configuration();
 
     public MergedConfiguration() {
     }
@@ -59,15 +59,15 @@ public class MergedConfiguration implements Parcelable {
 
     @Override
     public void writeToParcel(Parcel dest, int flags) {
-        dest.writeParcelable(mGlobalConfig, flags);
-        dest.writeParcelable(mOverrideConfig, flags);
-        dest.writeParcelable(mMergedConfig, flags);
+        mGlobalConfig.writeToParcel(dest, flags);
+        mOverrideConfig.writeToParcel(dest, flags);
+        mMergedConfig.writeToParcel(dest, flags);
     }
 
     public void readFromParcel(Parcel source) {
-        mGlobalConfig = source.readParcelable(Configuration.class.getClassLoader());
-        mOverrideConfig = source.readParcelable(Configuration.class.getClassLoader());
-        mMergedConfig = source.readParcelable(Configuration.class.getClassLoader());
+        mGlobalConfig.readFromParcel(source);
+        mOverrideConfig.readFromParcel(source);
+        mMergedConfig.readFromParcel(source);
     }
 
     @Override
diff --git a/core/java/android/view/InsetsSource.java b/core/java/android/view/InsetsSource.java
index 5f2bccc8b8578..e6cf68367ae66 100644
--- a/core/java/android/view/InsetsSource.java
+++ b/core/java/android/view/InsetsSource.java
@@ -261,11 +261,7 @@ public class InsetsSource implements Parcelable {
 
     public InsetsSource(Parcel in) {
         mType = in.readInt();
-        if (in.readInt() != 0) {
-            mFrame = Rect.CREATOR.createFromParcel(in);
-        } else {
-            mFrame = null;
-        }
+        mFrame = Rect.CREATOR.createFromParcel(in);
         if (in.readInt() != 0) {
             mVisibleFrame = Rect.CREATOR.createFromParcel(in);
         } else {
@@ -282,12 +278,7 @@ public class InsetsSource implements Parcelable {
     @Override
     public void writeToParcel(Parcel dest, int flags) {
         dest.writeInt(mType);
-        if (mFrame != null) {
-            dest.writeInt(1);
-            mFrame.writeToParcel(dest, 0);
-        } else {
-            dest.writeInt(0);
-        }
+        mFrame.writeToParcel(dest, 0);
         if (mVisibleFrame != null) {
             dest.writeInt(1);
             mVisibleFrame.writeToParcel(dest, 0);
diff --git a/core/java/android/view/InsetsSourceControl.java b/core/java/android/view/InsetsSourceControl.java
index c717c2adc32d4..1d4b4111f8842 100644
--- a/core/java/android/view/InsetsSourceControl.java
+++ b/core/java/android/view/InsetsSourceControl.java
@@ -77,8 +77,8 @@ public class InsetsSourceControl implements Parcelable {
 
     public InsetsSourceControl(Parcel in) {
         mType = in.readInt();
-        mLeash = in.readParcelable(null /* loader */);
-        mSurfacePosition = in.readParcelable(null /* loader */);
+        mLeash = in.readTypedObject(SurfaceControl.CREATOR);
+        mSurfacePosition = in.readTypedObject(Point.CREATOR);
         mSkipAnimationOnce = in.readBoolean();
     }
 
@@ -119,8 +119,8 @@ public class InsetsSourceControl implements Parcelable {
     @Override
     public void writeToParcel(Parcel dest, int flags) {
         dest.writeInt(mType);
-        dest.writeParcelable(mLeash, 0 /* flags*/);
-        dest.writeParcelable(mSurfacePosition, 0 /* flags*/);
+        dest.writeTypedObject(mLeash, 0 /* parcelableFlags */);
+        dest.writeTypedObject(mSurfacePosition, 0 /* parcelableFlags */);
         dest.writeBoolean(mSkipAnimationOnce);
     }
 
diff --git a/core/java/android/view/InsetsState.java b/core/java/android/view/InsetsState.java
index 21dd1fb056156..fce1952de44bf 100644
--- a/core/java/android/view/InsetsState.java
+++ b/core/java/android/view/InsetsState.java
@@ -156,7 +156,7 @@ public class InsetsState implements Parcelable {
     static final int ISIDE_FLOATING = 4;
     static final int ISIDE_UNKNOWN = 5;
 
-    private InsetsSource[] mSources = new InsetsSource[SIZE];
+    private final InsetsSource[] mSources = new InsetsSource[SIZE];
 
     /**
      * The frame of the display these sources are relative to.
@@ -804,7 +804,7 @@ public class InsetsState implements Parcelable {
     public void writeToParcel(Parcel dest, int flags) {
         mDisplayFrame.writeToParcel(dest, flags);
         mDisplayCutout.writeToParcel(dest, flags);
-        dest.writeParcelableArray(mSources, 0);
+        dest.writeTypedArray(mSources, 0 /* parcelableFlags */);
         dest.writeTypedObject(mRoundedCorners, flags);
     }
 
@@ -820,9 +820,9 @@ public class InsetsState implements Parcelable {
     };
 
     public void readFromParcel(Parcel in) {
-        mDisplayFrame.set(Rect.CREATOR.createFromParcel(in));
-        mDisplayCutout.set(DisplayCutout.ParcelableWrapper.CREATOR.createFromParcel(in));
-        mSources = in.readParcelableArray(null, InsetsSource.class);
+        mDisplayFrame.readFromParcel(in);
+        mDisplayCutout.readFromParcel(in);
+        in.readTypedArray(mSources, InsetsSource.CREATOR);
         mRoundedCorners = in.readTypedObject(RoundedCorners.CREATOR);
     }
 
diff --git a/core/java/android/window/ClientWindowFrames.java b/core/java/android/window/ClientWindowFrames.java
index e22a5eb9fe7be..acf9882e6658b 100644
--- a/core/java/android/window/ClientWindowFrames.java
+++ b/core/java/android/window/ClientWindowFrames.java
@@ -58,9 +58,9 @@ public class ClientWindowFrames implements Parcelable {
 
     /** Needed for AIDL out parameters. */
     public void readFromParcel(Parcel in) {
-        frame.set(Rect.CREATOR.createFromParcel(in));
-        displayFrame.set(Rect.CREATOR.createFromParcel(in));
-        backdropFrame.set(Rect.CREATOR.createFromParcel(in));
+        frame.readFromParcel(in);
+        displayFrame.readFromParcel(in);
+        backdropFrame.readFromParcel(in);
     }
 
     @Override
diff --git a/core/tests/benchmarks/src/android/os/ParcelableBenchmark.java b/core/tests/benchmarks/src/android/os/ParcelableBenchmark.java
new file mode 100644
index 0000000000000..1cf4302056272
--- /dev/null
+++ b/core/tests/benchmarks/src/android/os/ParcelableBenchmark.java
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.os;
+
+import android.annotation.SuppressLint;
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.util.MergedConfiguration;
+import android.view.InsetsSource;
+import android.view.InsetsState;
+
+import com.google.caliper.AfterExperiment;
+import com.google.caliper.BeforeExperiment;
+
+/**
+ * Benchmark of read/write large Parcelable class. This also shows the performance of different
+ * implementations for nested Parcelable class:
+ * <ul>
+ *   <li>Well-written read/writeFromParcel (direct access)</li>
+ *   <li>read/writeTypedObject (object creation + addition int to indicate nullity)</li>
+ *   <li>read/writeParcelable (object creation + addition type String)</li>
+ * </ul>
+ */
+public class ParcelableBenchmark {
+    private Parcel mParcel;
+
+    @BeforeExperiment
+    protected void setUp() {
+        mParcel = Parcel.obtain();
+    }
+
+    @AfterExperiment
+    protected void tearDown() {
+        mParcel.recycle();
+        mParcel = null;
+    }
+
+    public void timeReadWriteMergedConfiguration(int reps) {
+        final MergedConfiguration mergedConfiguration = new MergedConfiguration();
+        for (int i = 0; i < reps; i++) {
+            mergedConfiguration.writeToParcel(mParcel, 0);
+            mParcel.setDataPosition(0);
+            mergedConfiguration.readFromParcel(mParcel);
+        }
+    }
+
+    public void timeReadWriteInsetsState(int reps) {
+        final InsetsState insetsState = new InsetsState();
+        for (int i = 0; i < InsetsState.SIZE; i++) {
+            insetsState.addSource(new InsetsSource(i));
+        }
+        for (int i = 0; i < reps; i++) {
+            insetsState.writeToParcel(mParcel, 0);
+            mParcel.setDataPosition(0);
+            insetsState.readFromParcel(mParcel);
+        }
+    }
+
+    public void timeReadWritePointArray(int reps) {
+        final PointArray pointArray = new PointArray();
+        for (int i = 0; i < reps; i++) {
+            pointArray.writeToParcel(mParcel, 0);
+            mParcel.setDataPosition(0);
+            pointArray.readFromParcel(mParcel);
+        }
+    }
+
+    public void timeReadWritePointArrayFast(int reps) {
+        final PointArrayFast pointArray = new PointArrayFast();
+        for (int i = 0; i < reps; i++) {
+            pointArray.writeToParcel(mParcel, 0);
+            mParcel.setDataPosition(0);
+            pointArray.readFromParcel(mParcel);
+        }
+    }
+
+    @SuppressLint("ParcelCreator")
+    private static class PointArray implements Parcelable {
+        Rect mBounds = new Rect();
+        Point[] mPoints = new Point[10];
+        {
+            for (int i = 0; i < mPoints.length; i++) {
+                mPoints[i] = new Point();
+            }
+        }
+
+        @Override
+        public void writeToParcel(Parcel dest, int flags) {
+            dest.writeParcelable(mBounds, flags);
+            dest.writeParcelableArray(mPoints, flags);
+        }
+
+        void readFromParcel(Parcel in) {
+            mBounds = in.readParcelable(Rect.class.getClassLoader());
+            mPoints = in.readParcelableArray(Point.class.getClassLoader(), Point.class);
+        }
+
+        @Override
+        public int describeContents() {
+            return 0;
+        }
+    }
+
+    @SuppressLint("ParcelCreator")
+    private static class PointArrayFast extends PointArray {
+
+        @Override
+        public void writeToParcel(Parcel dest, int flags) {
+            mBounds.writeToParcel(dest, flags);
+            dest.writeTypedArray(mPoints, flags);
+        }
+
+        @Override
+        void readFromParcel(Parcel in) {
+            mBounds.readFromParcel(in);
+            in.readTypedArray(mPoints, Point.CREATOR);
+        }
+    }
+}