diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 4dfd918..86a5f9f 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -56,6 +56,14 @@
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_SWIPELEFT;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_SWIPERIGHT;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_WIDGET_RECONFIGURED;
+import static com.android.launcher3.logging.StatsLogManager.LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_ACTIVITY_ON_CREATE;
+import static com.android.launcher3.logging.StatsLogManager.LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION;
+import static com.android.launcher3.logging.StatsLogManager.LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_VIEW_INFLATION;
+import static com.android.launcher3.logging.StatsLogManager.LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC;
+import static com.android.launcher3.logging.StatsLogManager.LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC;
+import static com.android.launcher3.logging.StatsLogManager.StatsLatencyLogger.LatencyType.COLD;
+import static com.android.launcher3.logging.StatsLogManager.StatsLatencyLogger.LatencyType.COLD_DEVICE_REBOOTING;
+import static com.android.launcher3.logging.StatsLogManager.StatsLatencyLogger.LatencyType.WARM;
 import static com.android.launcher3.model.ItemInstallQueue.FLAG_ACTIVITY_PAUSED;
 import static com.android.launcher3.model.ItemInstallQueue.FLAG_DRAG_AND_DROP;
 import static com.android.launcher3.popup.SystemShortcut.APP_INFO;
@@ -64,7 +72,6 @@
 import static com.android.launcher3.states.RotationHelper.REQUEST_LOCK;
 import static com.android.launcher3.states.RotationHelper.REQUEST_NONE;
 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
-import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;
 import static com.android.launcher3.util.ItemInfoMatcher.forFolderMatch;
 
 import android.animation.Animator;
@@ -111,6 +118,7 @@
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.ViewTreeObserver;
 import android.view.ViewTreeObserver.OnPreDrawListener;
 import android.view.WindowManager.LayoutParams;
 import android.view.accessibility.AccessibilityEvent;
@@ -157,6 +165,7 @@
 import com.android.launcher3.logging.FileLog;
 import com.android.launcher3.logging.InstanceId;
 import com.android.launcher3.logging.InstanceIdSequence;
+import com.android.launcher3.logging.StartupLatencyLogger;
 import com.android.launcher3.logging.StatsLogManager;
 import com.android.launcher3.model.BgDataModel.Callbacks;
 import com.android.launcher3.model.ItemInstallQueue;
@@ -190,6 +199,7 @@
 import com.android.launcher3.util.ComponentKey;
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.IntSet;
+import com.android.launcher3.util.LockedUserState;
 import com.android.launcher3.util.OnboardingPrefs;
 import com.android.launcher3.util.PackageUserKey;
 import com.android.launcher3.util.PendingRequestArgs;
@@ -293,6 +303,8 @@
     public static final String ON_RESUME_EVT = "Launcher.onResume";
     public static final String ON_NEW_INTENT_EVT = "Launcher.onNewIntent";
 
+    private static boolean sIsNewProcess = true;
+
     private StateManager<LauncherState> mStateManager;
 
     private static final int ON_ACTIVITY_RESULT_ANIMATION_DELAY = 500;
@@ -404,12 +416,22 @@
 
     private StringCache mStringCache;
     private BaseSearchConfig mBaseSearchConfig;
-
+    private StartupLatencyLogger mStartupLatencyLogger;
     private CellPosMapper mCellPosMapper = CellPosMapper.DEFAULT;
 
     @Override
     @TargetApi(Build.VERSION_CODES.S)
     protected void onCreate(Bundle savedInstanceState) {
+        mStartupLatencyLogger = createStartupLatencyLogger(
+                sIsNewProcess
+                        ? LockedUserState.get(this).isUserUnlockedAtLauncherStartup()
+                            ? COLD
+                            : COLD_DEVICE_REBOOTING
+                        : WARM);
+        sIsNewProcess = false;
+        mStartupLatencyLogger
+                .logStart(LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION)
+                .logStart(LAUNCHER_LATENCY_STARTUP_ACTIVITY_ON_CREATE);
         // Only use a hard-coded cookie since we only want to trace this once.
         if (Utilities.ATLEAST_S) {
             Trace.beginAsyncSection(
@@ -518,6 +540,7 @@
             }
         }
 
+        mStartupLatencyLogger.logWorkspaceLoadStartTime();
         if (!mModel.addCallbacksAndLoad(this)) {
             if (!internalStateHandled) {
                 // If we are not binding synchronously, pause drawing until initial bind complete,
@@ -557,6 +580,17 @@
             getWindow().setSoftInputMode(LayoutParams.SOFT_INPUT_ADJUST_NOTHING);
         }
         setTitle(R.string.home_screen);
+        mStartupLatencyLogger.logEnd(LAUNCHER_LATENCY_STARTUP_ACTIVITY_ON_CREATE);
+    }
+
+    /**
+     * Create {@link StartupLatencyLogger} that only collects launcher startup latency metrics
+     * without sending them anywhere. Child class can override this method to create logger
+     * that overrides {@link StartupLatencyLogger#log()} to report those metrics.
+     */
+    protected StartupLatencyLogger createStartupLatencyLogger(
+            StatsLogManager.StatsLatencyLogger.LatencyType latencyType) {
+        return new StartupLatencyLogger(latencyType);
     }
 
     /**
@@ -1290,7 +1324,10 @@
      * Finds all the views we need and configure them properly.
      */
     protected void setupViews() {
+        mStartupLatencyLogger.logStart(LAUNCHER_LATENCY_STARTUP_VIEW_INFLATION);
         inflateRootView(R.layout.launcher);
+        mStartupLatencyLogger.logEnd(LAUNCHER_LATENCY_STARTUP_VIEW_INFLATION);
+
         mDragLayer = findViewById(R.id.drag_layer);
         mFocusHandler = mDragLayer.getFocusIndicatorHelper();
         mWorkspace = mDragLayer.findViewById(R.id.workspace);
@@ -2695,7 +2732,8 @@
 
     @Override
     @TargetApi(Build.VERSION_CODES.S)
-    public void onInitialBindComplete(IntSet boundPages, RunnableList pendingTasks) {
+    public void onInitialBindComplete(IntSet boundPages, RunnableList pendingTasks,
+            int workspaceItemCount, boolean isBindSync) {
         mSynchronouslyBoundPages = boundPages;
         mPagesToBindSynchronously = new IntSet();
 
@@ -2719,6 +2757,26 @@
             Trace.endAsyncSection(DISPLAY_WORKSPACE_TRACE_METHOD_NAME,
                     DISPLAY_WORKSPACE_TRACE_COOKIE);
         }
+        mStartupLatencyLogger
+                .logCardinality(workspaceItemCount)
+                .logEnd(isBindSync
+                        ? LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC
+                        : LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC);
+        // In the first rootview's onDraw after onInitialBindComplete(), log end of startup latency.
+        getRootView().getViewTreeObserver().addOnDrawListener(
+                new ViewTreeObserver.OnDrawListener() {
+
+                    @Override
+                    public void onDraw() {
+                        mStartupLatencyLogger
+                                .logEnd(LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION)
+                                .log()
+                                .reset();
+                        MAIN_EXECUTOR.getHandler().postAtFrontOfQueue(
+                                () -> getRootView().getViewTreeObserver()
+                                        .removeOnDrawListener(this));
+                    }
+                });
     }
 
     /**
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 6798667d..d3e94e1 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -417,7 +417,7 @@
                 if (bindDirectly) {
                     // Divide the set of loaded items into those that we are binding synchronously,
                     // and everything else that is to be bound normally (asynchronously).
-                    launcherBinder.bindWorkspace(bindAllCallbacks);
+                    launcherBinder.bindWorkspace(bindAllCallbacks, /* isBindSync= */ true);
                     // For now, continue posting the binding of AllApps as there are other
                     // issues that arise from that.
                     launcherBinder.bindAllApps();
diff --git a/src/com/android/launcher3/logging/StartupLatencyLogger.kt b/src/com/android/launcher3/logging/StartupLatencyLogger.kt
new file mode 100644
index 0000000..435f798
--- /dev/null
+++ b/src/com/android/launcher3/logging/StartupLatencyLogger.kt
@@ -0,0 +1,203 @@
+package com.android.launcher3.logging
+
+import android.os.SystemClock
+import android.util.Log
+import android.util.SparseLongArray
+import androidx.annotation.MainThread
+import androidx.annotation.VisibleForTesting
+import androidx.core.util.contains
+import androidx.core.util.isEmpty
+import com.android.launcher3.BuildConfig
+import com.android.launcher3.logging.StatsLogManager.LauncherLatencyEvent
+import com.android.launcher3.logging.StatsLogManager.StatsLatencyLogger.LatencyType
+import com.android.launcher3.util.Preconditions
+
+/** Logger for logging Launcher activity's startup latency. */
+open class StartupLatencyLogger(val latencyType: LatencyType) {
+
+    companion object {
+        const val TAG = "LauncherStartupLatencyLogger"
+        const val UNSET_INT = -1
+        const val UNSET_LONG = -1L
+    }
+
+    @VisibleForTesting val startTimeByEvent = SparseLongArray()
+    @VisibleForTesting val endTimeByEvent = SparseLongArray()
+
+    @VisibleForTesting var cardinality: Int = UNSET_INT
+    @VisibleForTesting var workspaceLoadStartTime: Long = UNSET_LONG
+
+    private var isInTest = false
+
+    /** Subclass can override this method to handle collected latency metrics. */
+    @MainThread
+    open fun log(): StartupLatencyLogger {
+        return this
+    }
+
+    @MainThread
+    fun logWorkspaceLoadStartTime() = logWorkspaceLoadStartTime(SystemClock.elapsedRealtime())
+
+    @VisibleForTesting
+    @MainThread
+    fun logWorkspaceLoadStartTime(startTimeMs: Long): StartupLatencyLogger {
+        Preconditions.assertUIThread()
+        workspaceLoadStartTime = startTimeMs
+        return this
+    }
+
+    /**
+     * Log size of workspace. Larger number of workspace items (icons, folders, widgets) means
+     * longer latency to initialize workspace.
+     */
+    @MainThread
+    fun logCardinality(cardinality: Int): StartupLatencyLogger {
+        Preconditions.assertUIThread()
+        this.cardinality = cardinality
+        return this
+    }
+
+    @MainThread
+    fun logStart(event: LauncherLatencyEvent) = logStart(event, SystemClock.elapsedRealtime())
+
+    @MainThread
+    fun logStart(event: LauncherLatencyEvent, startTimeMs: Long): StartupLatencyLogger {
+        // In unit test no looper is attached to current thread
+        Preconditions.assertUIThread()
+        if (validateLoggingEventAtStart(event)) {
+            startTimeByEvent.put(event.id, startTimeMs)
+        }
+        return this
+    }
+
+    @MainThread
+    fun logEnd(event: LauncherLatencyEvent) = logEnd(event, SystemClock.elapsedRealtime())
+
+    @MainThread
+    fun logEnd(event: LauncherLatencyEvent, endTimeMs: Long): StartupLatencyLogger {
+        // In unit test no looper is attached to current thread
+        Preconditions.assertUIThread()
+        maybeLogStartOfWorkspaceLoadTime(event)
+        if (validateLoggingEventAtEnd(event)) {
+            endTimeByEvent.put(event.id, endTimeMs)
+        }
+
+        return this
+    }
+
+    @MainThread
+    fun reset() {
+        // In unit test no looper is attached to current thread
+        Preconditions.assertUIThread()
+        startTimeByEvent.clear()
+        endTimeByEvent.clear()
+        cardinality = UNSET_INT
+        workspaceLoadStartTime = UNSET_LONG
+    }
+
+    @MainThread
+    private fun maybeLogStartOfWorkspaceLoadTime(event: LauncherLatencyEvent) {
+        if (workspaceLoadStartTime == UNSET_LONG) {
+            return
+        }
+        if (
+            event == LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC ||
+                event == LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC
+        ) {
+            logStart(event, workspaceLoadStartTime)
+            workspaceLoadStartTime = UNSET_LONG
+        }
+    }
+
+    /** @return true if we can log start of [LauncherLatencyEvent] and vice versa. */
+    @MainThread
+    private fun validateLoggingEventAtStart(event: LauncherLatencyEvent): Boolean {
+        if (!BuildConfig.IS_STUDIO_BUILD && !isInTest) {
+            return true
+        }
+        if (startTimeByEvent.contains(event.id)) {
+            Log.e(TAG, String.format("Cannot restart same %s event", event.name))
+            return false
+        } else if (
+            startTimeByEvent.isEmpty() &&
+                event != LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION
+        ) {
+            Log.e(
+                TAG,
+                String.format(
+                    "The first log start event must be %s.",
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION.name
+                )
+            )
+            return false
+        } else if (
+            event == LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC &&
+                startTimeByEvent.get(
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC.id
+                ) != 0L
+        ) {
+            Log.e(
+                TAG,
+                String.format(
+                    "Cannot start %s event after %s starts",
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC.name,
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC.name
+                )
+            )
+            return false
+        } else if (
+            event == LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC &&
+                startTimeByEvent.get(
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC.id
+                ) != 0L
+        ) {
+            Log.e(
+                TAG,
+                String.format(
+                    "Cannot start %s event after %s starts",
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC.name,
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC.name
+                )
+            )
+            return false
+        }
+
+        return true
+    }
+
+    /** @return true if we can log end of [LauncherLatencyEvent] and vice versa. */
+    @MainThread
+    private fun validateLoggingEventAtEnd(event: LauncherLatencyEvent): Boolean {
+        if (!BuildConfig.IS_STUDIO_BUILD && !isInTest) {
+            return true
+        }
+        if (!startTimeByEvent.contains(event.id)) {
+            Log.e(TAG, String.format("Cannot end %s event before starting it", event.name))
+            return false
+        } else if (endTimeByEvent.contains(event.id)) {
+            Log.e(TAG, String.format("Cannot end same %s event again", event.name))
+            return false
+        } else if (
+            event != LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION &&
+                endTimeByEvent.contains(
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION.id
+                )
+        ) {
+            Log.e(
+                TAG,
+                String.format(
+                    "Cannot end %s event after %s",
+                    event.name,
+                    LauncherLatencyEvent.LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION.name
+                )
+            )
+            return false
+        }
+        return true
+    }
+
+    @VisibleForTesting
+    fun setIsInTest() {
+        isInTest = true
+    }
+}
diff --git a/src/com/android/launcher3/logging/StatsLogManager.java b/src/com/android/launcher3/logging/StatsLogManager.java
index 5b4a02b..8197b73 100644
--- a/src/com/android/launcher3/logging/StatsLogManager.java
+++ b/src/com/android/launcher3/logging/StatsLogManager.java
@@ -657,6 +657,39 @@
         }
     }
 
+    /** Launcher's latency events. */
+    public enum LauncherLatencyEvent implements EventEnum {
+        // Details of below 6 events with prefix of "LAUNCHER_LATENCY_STARTUP_" are discussed in
+        // go/launcher-startup-latency
+        @UiEvent(doc = "The total duration of launcher startup latency.")
+        LAUNCHER_LATENCY_STARTUP_TOTAL_DURATION(1362),
+
+        @UiEvent(doc = "The duration of launcher activity's onCreate().")
+        LAUNCHER_LATENCY_STARTUP_ACTIVITY_ON_CREATE(1363),
+
+        @UiEvent(doc =
+                "The duration to inflate launcher root view in launcher activity's onCreate().")
+        LAUNCHER_LATENCY_STARTUP_VIEW_INFLATION(1364),
+
+        @UiEvent(doc = "The duration of synchronous loading workspace")
+        LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_SYNC(1366),
+
+        @UiEvent(doc = "The duration of asynchronous loading workspace")
+        LAUNCHER_LATENCY_STARTUP_WORKSPACE_LOADER_ASYNC(1367),
+        ;
+
+        private final int mId;
+
+        LauncherLatencyEvent(int id) {
+            mId = id;
+        }
+
+        @Override
+        public int getId() {
+            return mId;
+        }
+    }
+
     /**
      * Launcher specific ranking related events.
      */
@@ -807,7 +840,10 @@
             CONTROLLED(7),
             CACHED(8),
             // example: device is rebooting via power key or shell command `adb reboot`
-            COLD_DEVICE_REBOOTING(9);
+            COLD_DEVICE_REBOOTING(9),
+            // Tracking warm startup latency:
+            // https://developer.android.com/topic/performance/vitals/launch-time#warm
+            WARM(10);
             private final int mId;
 
             LatencyType(int id) {
diff --git a/src/com/android/launcher3/model/BaseLauncherBinder.java b/src/com/android/launcher3/model/BaseLauncherBinder.java
index c946e2c..ba9eb20 100644
--- a/src/com/android/launcher3/model/BaseLauncherBinder.java
+++ b/src/com/android/launcher3/model/BaseLauncherBinder.java
@@ -78,14 +78,14 @@
     /**
      * Binds all loaded data to actual views on the main thread.
      */
-    public void bindWorkspace(boolean incrementBindId) {
+    public void bindWorkspace(boolean incrementBindId, boolean isBindSync) {
         if (FeatureFlags.ENABLE_WORKSPACE_LOADING_OPTIMIZATION.get()) {
             DisjointWorkspaceBinder workspaceBinder =
                     initWorkspaceBinder(incrementBindId, mBgDataModel.collectWorkspaceScreens());
-            workspaceBinder.bindCurrentWorkspacePages();
+            workspaceBinder.bindCurrentWorkspacePages(isBindSync);
             workspaceBinder.bindOtherWorkspacePages();
         } else {
-            bindWorkspaceAllAtOnce(incrementBindId);
+            bindWorkspaceAllAtOnce(incrementBindId, isBindSync);
         }
     }
 
@@ -108,13 +108,13 @@
         }
     }
 
-    private void bindWorkspaceAllAtOnce(boolean incrementBindId) {
+    private void bindWorkspaceAllAtOnce(boolean incrementBindId, boolean isBindSync) {
         // Save a copy of all the bg-thread collections
         ArrayList<ItemInfo> workspaceItems = new ArrayList<>();
         ArrayList<LauncherAppWidgetInfo> appWidgets = new ArrayList<>();
         final IntArray orderedScreenIds = new IntArray();
         ArrayList<FixedContainerItems> extraItems = new ArrayList<>();
-
+        final int workspaceItemCount;
         synchronized (mBgDataModel) {
             workspaceItems.addAll(mBgDataModel.workspaceItems);
             appWidgets.addAll(mBgDataModel.appWidgets);
@@ -124,11 +124,13 @@
                 mBgDataModel.lastBindId++;
             }
             mMyBindingId = mBgDataModel.lastBindId;
+            workspaceItemCount = mBgDataModel.itemsIdMap.size();
         }
 
         for (Callbacks cb : mCallbacksList) {
             new UnifiedWorkspaceBinder(cb, mUiExecutor, mApp, mBgDataModel, mMyBindingId,
-                    workspaceItems, appWidgets, extraItems, orderedScreenIds).bind();
+                    workspaceItems, appWidgets, extraItems, orderedScreenIds)
+                    .bind(isBindSync, workspaceItemCount);
         }
     }
 
@@ -246,7 +248,7 @@
             mOrderedScreenIds = orderedScreenIds;
         }
 
-        private void bind() {
+        private void bind(boolean isBindSync, int workspaceItemCount) {
             final IntSet currentScreenIds =
                     mCallbacks.getPagesToBindSynchronously(mOrderedScreenIds);
             Objects.requireNonNull(currentScreenIds, "Null screen ids provided by " + mCallbacks);
@@ -297,7 +299,8 @@
             executeCallbacksTask(
                     c -> {
                         MODEL_EXECUTOR.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
-                        c.onInitialBindComplete(currentScreenIds, pendingTasks);
+                        c.onInitialBindComplete(
+                                currentScreenIds, pendingTasks, workspaceItemCount, isBindSync);
                     }, mUiExecutor);
 
             mCallbacks.bindStringCache(mBgDataModel.stringCache.clone());
@@ -361,18 +364,19 @@
          * loaded, it will bind all workspace items immediately, and bindOtherWorkspacePages() will
          * not bind any items.
          */
-        protected void bindCurrentWorkspacePages() {
+        protected void bindCurrentWorkspacePages(boolean isBindSync) {
             // Save a copy of all the bg-thread collections
             ArrayList<ItemInfo> workspaceItems;
             ArrayList<LauncherAppWidgetInfo> appWidgets;
             ArrayList<FixedContainerItems> fciList = new ArrayList<>();
-
+            final int workspaceItemCount;
             synchronized (mBgDataModel) {
                 workspaceItems = new ArrayList<>(mBgDataModel.workspaceItems);
                 appWidgets = new ArrayList<>(mBgDataModel.appWidgets);
                 if (!FeatureFlags.CHANGE_MODEL_DELEGATE_LOADING_ORDER.get()) {
                     mBgDataModel.extraItems.forEach(fciList::add);
                 }
+                workspaceItemCount = mBgDataModel.itemsIdMap.size();
             }
 
             workspaceItems.forEach(it -> mBoundItemIds.add(it.id));
@@ -395,10 +399,10 @@
 
             bindWorkspaceItems(workspaceItems);
             bindAppWidgets(appWidgets);
-
             executeCallbacksTask(c -> {
                 MODEL_EXECUTOR.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
-                c.onInitialBindComplete(mCurrentScreenIds, new RunnableList());
+                c.onInitialBindComplete(
+                        mCurrentScreenIds, new RunnableList(), workspaceItemCount, isBindSync);
             }, mUiExecutor);
         }
 
diff --git a/src/com/android/launcher3/model/BgDataModel.java b/src/com/android/launcher3/model/BgDataModel.java
index 0e3b06c..0861e9d 100644
--- a/src/com/android/launcher3/model/BgDataModel.java
+++ b/src/com/android/launcher3/model/BgDataModel.java
@@ -484,7 +484,9 @@
         default void bindWorkspaceComponentsRemoved(Predicate<ItemInfo> matcher) { }
         default void bindAllWidgets(List<WidgetsListBaseEntry> widgets) { }
 
-        default void onInitialBindComplete(IntSet boundPages, RunnableList pendingTasks) {
+        /** Called when workspace has been bound. */
+        default void onInitialBindComplete(IntSet boundPages, RunnableList pendingTasks,
+                int workspaceItemCount, boolean isBindSync) {
             pendingTasks.executeAllAndDestroy();
         }
 
diff --git a/src/com/android/launcher3/model/LoaderTask.java b/src/com/android/launcher3/model/LoaderTask.java
index 481cc6e..9053d19 100644
--- a/src/com/android/launcher3/model/LoaderTask.java
+++ b/src/com/android/launcher3/model/LoaderTask.java
@@ -232,7 +232,7 @@
             }
 
             verifyNotStopped();
-            mLauncherBinder.bindWorkspace(true /* incrementBindId */);
+            mLauncherBinder.bindWorkspace(true /* incrementBindId */, /* isBindSync= */ false);
             logASplit(timingLogger, "bindWorkspace");
 
             mModelDelegate.workspaceLoadComplete();
diff --git a/src/com/android/launcher3/util/LockedUserState.kt b/src/com/android/launcher3/util/LockedUserState.kt
index f5e13d2..1231604 100644
--- a/src/com/android/launcher3/util/LockedUserState.kt
+++ b/src/com/android/launcher3/util/LockedUserState.kt
@@ -7,6 +7,7 @@
 import androidx.annotation.VisibleForTesting
 
 class LockedUserState(private val mContext: Context) : SafeCloseable {
+    val isUserUnlockedAtLauncherStartup: Boolean
     var isUserUnlocked: Boolean
         private set
     private val mUserUnlockedActions: RunnableList = RunnableList()
@@ -20,10 +21,17 @@
     }
 
     init {
+        // 1) when user reboots devices, launcher process starts at lock screen and both
+        // isUserUnlocked and isUserUnlockedAtLauncherStartup are init as false. After user unlocks
+        // screen, isUserUnlocked will be updated to true via Intent.ACTION_USER_UNLOCKED,
+        // yet isUserUnlockedAtLauncherStartup will remains as false.
+        // 2) when launcher process restarts after user has unlocked screen, both variable are
+        // init as true and will not change.
         isUserUnlocked =
             mContext
                 .getSystemService(UserManager::class.java)!!
                 .isUserUnlocked(Process.myUserHandle())
+        isUserUnlockedAtLauncherStartup = isUserUnlocked
         if (isUserUnlocked) {
             notifyUserUnlocked()
         } else {