diff --git a/packages/SystemUI/customization/src/com/android/systemui/shared/clocks/DefaultClockController.kt b/packages/SystemUI/customization/src/com/android/systemui/shared/clocks/DefaultClockController.kt
index 7645dec..d110850 100644
--- a/packages/SystemUI/customization/src/com/android/systemui/shared/clocks/DefaultClockController.kt
+++ b/packages/SystemUI/customization/src/com/android/systemui/shared/clocks/DefaultClockController.kt
@@ -85,7 +85,8 @@
         animations = DefaultClockAnimations(dozeFraction, foldFraction)
         events.onColorPaletteChanged(resources)
         events.onTimeZoneChanged(TimeZone.getDefault())
-        events.onTimeTick()
+        smallClock.events.onTimeTick()
+        largeClock.events.onTimeTick()
     }
 
     open inner class DefaultClockFaceController(
@@ -109,6 +110,8 @@
 
         override val events =
             object : ClockFaceEvents {
+                override fun onTimeTick() = view.refreshTime()
+
                 override fun onRegionDarknessChanged(isRegionDark: Boolean) {
                     this@DefaultClockFaceController.isRegionDark = isRegionDark
                     updateColor()
@@ -169,8 +172,6 @@
     }
 
     inner class DefaultClockEvents : ClockEvents {
-        override fun onTimeTick() = clocks.forEach { it.refreshTime() }
-
         override fun onTimeFormatChanged(is24Hr: Boolean) =
             clocks.forEach { it.refreshFormat(is24Hr) }
 
diff --git a/packages/SystemUI/plugin/src/com/android/systemui/plugins/ClockProviderPlugin.kt b/packages/SystemUI/plugin/src/com/android/systemui/plugins/ClockProviderPlugin.kt
index a2a0709..7727589 100644
--- a/packages/SystemUI/plugin/src/com/android/systemui/plugins/ClockProviderPlugin.kt
+++ b/packages/SystemUI/plugin/src/com/android/systemui/plugins/ClockProviderPlugin.kt
@@ -66,7 +66,8 @@
         events.onColorPaletteChanged(resources)
         animations.doze(dozeFraction)
         animations.fold(foldFraction)
-        events.onTimeTick()
+        smallClock.events.onTimeTick()
+        largeClock.events.onTimeTick()
     }
 
     /** Optional method for dumping debug information */
@@ -87,9 +88,6 @@
 
 /** Events that should call when various rendering parameters change */
 interface ClockEvents {
-    /** Call every time tick */
-    fun onTimeTick() {}
-
     /** Call whenever timezone changes */
     fun onTimeZoneChanged(timeZone: TimeZone) {}
 
@@ -131,6 +129,13 @@
 
 /** Events that have specific data about the related face */
 interface ClockFaceEvents {
+    /** Call every time tick */
+    fun onTimeTick() {}
+
+    /** Expected interval between calls to onTimeTick. Can always reduce to PER_MINUTE in AOD. */
+    val tickRate: ClockTickRate
+        get() = ClockTickRate.PER_MINUTE
+
     /** Region Darkness specific to the clock face */
     fun onRegionDarknessChanged(isDark: Boolean) {}
 
@@ -150,6 +155,13 @@
     fun onTargetRegionChanged(targetRegion: Rect?) {}
 }
 
+/** Tick rates for clocks */
+enum class ClockTickRate(val value: Int) {
+    PER_MINUTE(2), // Update the clock once per minute.
+    PER_SECOND(1), // Update the clock once per second.
+    PER_FRAME(0), // Update the clock every second.
+}
+
 /** Some data about a clock design */
 data class ClockMetadata(
     val clockId: ClockId,
diff --git a/packages/SystemUI/src/com/android/keyguard/ClockEventController.kt b/packages/SystemUI/src/com/android/keyguard/ClockEventController.kt
index 3a940e9..7a094a7 100644
--- a/packages/SystemUI/src/com/android/keyguard/ClockEventController.kt
+++ b/packages/SystemUI/src/com/android/keyguard/ClockEventController.kt
@@ -25,6 +25,7 @@
 import android.util.TypedValue
 import android.view.View
 import android.widget.FrameLayout
+import android.view.ViewTreeObserver
 import androidx.annotation.VisibleForTesting
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.repeatOnLifecycle
@@ -42,12 +43,15 @@
 import com.android.systemui.log.dagger.KeyguardSmallClockLog
 import com.android.systemui.log.dagger.KeyguardLargeClockLog
 import com.android.systemui.plugins.ClockController
+import com.android.systemui.plugins.ClockFaceController
+import com.android.systemui.plugins.ClockTickRate
 import com.android.systemui.plugins.log.LogBuffer
 import com.android.systemui.plugins.log.LogLevel.DEBUG
 import com.android.systemui.shared.regionsampling.RegionSampler
 import com.android.systemui.statusbar.policy.BatteryController
 import com.android.systemui.statusbar.policy.BatteryController.BatteryStateChangeCallback
 import com.android.systemui.statusbar.policy.ConfigurationController
+import com.android.systemui.util.concurrency.DelayableExecutor
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.DisposableHandle
 import kotlinx.coroutines.Job
@@ -72,7 +76,7 @@
     private val configurationController: ConfigurationController,
     @Main private val resources: Resources,
     private val context: Context,
-    @Main private val mainExecutor: Executor,
+    @Main private val mainExecutor: DelayableExecutor,
     @Background private val bgExecutor: Executor,
     @KeyguardSmallClockLog private val smallLogBuffer: LogBuffer?,
     @KeyguardLargeClockLog private val largeLogBuffer: LogBuffer?,
@@ -94,6 +98,7 @@
                     clock?.largeClock?.view?.addOnLayoutChangeListener(mLayoutChangedListener)
                 }
                 updateFontSizes()
+                updateTimeListeners()
             }
         }
 
@@ -208,6 +213,10 @@
     }
 
     var regionSampler: RegionSampler? = null
+    var smallTimeListener: TimeListener? = null
+    var largeTimeListener: TimeListener? = null
+    val shouldTimeListenerRun: Boolean
+        get() = isKeyguardVisible && dozeAmount < DOZE_TICKRATE_THRESHOLD
 
     private var smallClockIsDark = true
     private var largeClockIsDark = true
@@ -246,6 +255,9 @@
                     clock?.animations?.doze(if (isDozing) 1f else 0f)
                 }
             }
+
+            smallTimeListener?.update(shouldTimeListenerRun)
+            largeTimeListener?.update(shouldTimeListenerRun)
         }
 
         override fun onTimeFormatChanged(timeFormat: String) {
@@ -285,6 +297,8 @@
                 }
             }
         }
+        smallTimeListener?.update(shouldTimeListenerRun)
+        largeTimeListener?.update(shouldTimeListenerRun)
     }
 
     fun unregisterListeners() {
@@ -299,6 +313,25 @@
         batteryController.removeCallback(batteryCallback)
         keyguardUpdateMonitor.removeCallback(keyguardUpdateMonitorCallback)
         regionSampler?.stopRegionSampler()
+        smallTimeListener?.stop()
+        largeTimeListener?.stop()
+    }
+
+    private fun updateTimeListeners() {
+        smallTimeListener?.stop()
+        largeTimeListener?.stop()
+
+        smallTimeListener = null
+        largeTimeListener = null
+
+        clock?.smallClock?.let {
+            smallTimeListener = TimeListener(it, mainExecutor)
+            smallTimeListener?.update(shouldTimeListenerRun)
+        }
+        clock?.largeClock?.let {
+            largeTimeListener = TimeListener(it, mainExecutor)
+            largeTimeListener?.update(shouldTimeListenerRun)
+        }
     }
 
     private fun updateFontSizes() {
@@ -308,12 +341,18 @@
             resources.getDimensionPixelSize(R.dimen.large_clock_text_size).toFloat())
     }
 
+    private fun handleDoze(doze: Float) {
+        dozeAmount = doze
+        clock?.animations?.doze(dozeAmount)
+        smallTimeListener?.update(doze < DOZE_TICKRATE_THRESHOLD)
+        largeTimeListener?.update(doze < DOZE_TICKRATE_THRESHOLD)
+    }
+
     @VisibleForTesting
     internal fun listenForDozeAmount(scope: CoroutineScope): Job {
         return scope.launch {
             keyguardInteractor.dozeAmount.collect {
-                dozeAmount = it
-                clock?.animations?.doze(dozeAmount)
+                handleDoze(it)
             }
         }
     }
@@ -322,8 +361,7 @@
     internal fun listenForDozeAmountTransition(scope: CoroutineScope): Job {
         return scope.launch {
             keyguardTransitionInteractor.dozeAmountTransition.collect {
-                dozeAmount = it.value
-                clock?.animations?.doze(dozeAmount)
+                handleDoze(it.value)
             }
         }
     }
@@ -338,8 +376,7 @@
             keyguardTransitionInteractor.anyStateToAodTransition.filter {
                 it.transitionState == TransitionState.FINISHED
             }.collect {
-                dozeAmount = 1f
-                clock?.animations?.doze(dozeAmount)
+                handleDoze(1f)
             }
         }
     }
@@ -359,7 +396,54 @@
         }
     }
 
+    class TimeListener(val clockFace: ClockFaceController, val executor: DelayableExecutor) {
+        val predrawListener = ViewTreeObserver.OnPreDrawListener {
+            clockFace.events.onTimeTick()
+            true
+        }
+
+        val secondsRunnable = object : Runnable {
+            override fun run() {
+                if (!isRunning) {
+                    return
+                }
+
+                executor.executeDelayed(this, 990)
+                clockFace.events.onTimeTick()
+            }
+        }
+
+        var isRunning: Boolean = false
+            private set
+
+        fun start() {
+            if (isRunning) {
+                return
+            }
+
+            isRunning = true
+            when (clockFace.events.tickRate) {
+                ClockTickRate.PER_MINUTE -> {/* Handled by KeyguardClockSwitchController */}
+                ClockTickRate.PER_SECOND -> executor.execute(secondsRunnable)
+                ClockTickRate.PER_FRAME -> {
+                    clockFace.view.viewTreeObserver.addOnPreDrawListener(predrawListener)
+                    clockFace.view.invalidate()
+                }
+            }
+        }
+
+        fun stop() {
+            if (!isRunning) { return }
+
+            isRunning = false
+            clockFace.view.viewTreeObserver.removeOnPreDrawListener(predrawListener)
+        }
+
+        fun update(shouldRun: Boolean) = if (shouldRun) start() else stop()
+    }
+
     companion object {
         private val TAG = ClockEventController::class.simpleName!!
+        private val DOZE_TICKRATE_THRESHOLD = 0.99f
     }
 }
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardClockSwitchController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardClockSwitchController.java
index dd42c8e..3eec565 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardClockSwitchController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardClockSwitchController.java
@@ -344,7 +344,8 @@
         }
         ClockController clock = getClock();
         if (clock != null) {
-            clock.getEvents().onTimeTick();
+            clock.getSmallClock().getEvents().onTimeTick();
+            clock.getLargeClock().getEvents().onTimeTick();
         }
     }
 
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/ui/preview/KeyguardPreviewRenderer.kt b/packages/SystemUI/src/com/android/systemui/keyguard/ui/preview/KeyguardPreviewRenderer.kt
index 8808574..adde595 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/ui/preview/KeyguardPreviewRenderer.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/ui/preview/KeyguardPreviewRenderer.kt
@@ -177,7 +177,8 @@
         val receiver =
             object : BroadcastReceiver() {
                 override fun onReceive(context: Context?, intent: Intent?) {
-                    clockController.clock?.events?.onTimeTick()
+                    clockController.clock?.smallClock?.events?.onTimeTick()
+                    clockController.clock?.largeClock?.events?.onTimeTick()
                 }
             }
         broadcastDispatcher.registerReceiver(
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/ClockEventControllerTest.kt b/packages/SystemUI/tests/src/com/android/keyguard/ClockEventControllerTest.kt
index b9c23d4..43a2017 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/ClockEventControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/keyguard/ClockEventControllerTest.kt
@@ -32,10 +32,12 @@
 import com.android.systemui.plugins.ClockEvents
 import com.android.systemui.plugins.ClockFaceController
 import com.android.systemui.plugins.ClockFaceEvents
+import com.android.systemui.plugins.ClockTickRate
 import com.android.systemui.plugins.log.LogBuffer
 import com.android.systemui.statusbar.CommandQueue
 import com.android.systemui.statusbar.policy.BatteryController
 import com.android.systemui.statusbar.policy.ConfigurationController
+import com.android.systemui.util.concurrency.DelayableExecutor
 import com.android.systemui.util.mockito.any
 import com.android.systemui.util.mockito.argumentCaptor
 import com.android.systemui.util.mockito.capture
@@ -72,7 +74,7 @@
     @Mock private lateinit var animations: ClockAnimations
     @Mock private lateinit var events: ClockEvents
     @Mock private lateinit var clock: ClockController
-    @Mock private lateinit var mainExecutor: Executor
+    @Mock private lateinit var mainExecutor: DelayableExecutor
     @Mock private lateinit var bgExecutor: Executor
     @Mock private lateinit var featureFlags: FeatureFlags
     @Mock private lateinit var smallClockController: ClockFaceController
@@ -97,6 +99,8 @@
         whenever(largeClockController.events).thenReturn(largeClockEvents)
         whenever(clock.events).thenReturn(events)
         whenever(clock.animations).thenReturn(animations)
+        whenever(smallClockEvents.tickRate).thenReturn(ClockTickRate.PER_MINUTE)
+        whenever(largeClockEvents.tickRate).thenReturn(ClockTickRate.PER_MINUTE)
 
         repository = FakeKeyguardRepository()
 
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardClockSwitchControllerTest.java b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardClockSwitchControllerTest.java
index 512c351..36b3f89 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardClockSwitchControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardClockSwitchControllerTest.java
@@ -48,6 +48,7 @@
 import com.android.systemui.plugins.ClockController;
 import com.android.systemui.plugins.ClockEvents;
 import com.android.systemui.plugins.ClockFaceController;
+import com.android.systemui.plugins.ClockFaceEvents;
 import com.android.systemui.plugins.log.LogBuffer;
 import com.android.systemui.plugins.statusbar.StatusBarStateController;
 import com.android.systemui.shared.clocks.AnimatableClockView;
@@ -100,6 +101,8 @@
     @Mock
     private ClockEvents mClockEvents;
     @Mock
+    private ClockFaceEvents mClockFaceEvents;
+    @Mock
     DumpManager mDumpManager;
     @Mock
     ClockEventController mClockEventController;
@@ -176,6 +179,8 @@
         when(mClockController.getLargeClock()).thenReturn(mLargeClockController);
         when(mClockController.getSmallClock()).thenReturn(mSmallClockController);
         when(mClockController.getEvents()).thenReturn(mClockEvents);
+        when(mSmallClockController.getEvents()).thenReturn(mClockFaceEvents);
+        when(mLargeClockController.getEvents()).thenReturn(mClockFaceEvents);
         when(mClockController.getAnimations()).thenReturn(mClockAnimations);
         when(mClockRegistry.createCurrentClock()).thenReturn(mClockController);
         when(mClockEventController.getClock()).thenReturn(mClockController);
diff --git a/packages/SystemUI/tests/src/com/android/systemui/shared/clocks/DefaultClockProviderTest.kt b/packages/SystemUI/tests/src/com/android/systemui/shared/clocks/DefaultClockProviderTest.kt
index a7588dd..cd2efc0 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/shared/clocks/DefaultClockProviderTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/shared/clocks/DefaultClockProviderTest.kt
@@ -114,7 +114,8 @@
     @Test
     fun defaultClock_events_onTimeTick() {
         val clock = provider.createClock(DEFAULT_CLOCK_ID)
-        clock.events.onTimeTick()
+        clock.smallClock.events.onTimeTick()
+        clock.largeClock.events.onTimeTick()
 
         verify(mockSmallClockView).refreshTime()
         verify(mockLargeClockView).refreshTime()