diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.js b/packages/react-reconciler/src/ReactFiberBeginWork.js
index 7b5b2f72b1e0c..043181597d7e7 100644
--- a/packages/react-reconciler/src/ReactFiberBeginWork.js
+++ b/packages/react-reconciler/src/ReactFiberBeginWork.js
@@ -142,7 +142,6 @@ import {
   OffscreenLane,
   DefaultHydrationLane,
   SomeRetryLane,
-  NoTimestamp,
   includesSomeLane,
   laneToLanes,
   removeLanes,
@@ -2876,15 +2875,8 @@ function updateDehydratedSuspenseComponent(
           // is one of the very rare times where we mutate the current tree
           // during the render phase.
           suspenseState.retryLane = attemptHydrationAtLane;
-          // TODO: Ideally this would inherit the event time of the current render
-          const eventTime = NoTimestamp;
           enqueueConcurrentRenderForLane(current, attemptHydrationAtLane);
-          scheduleUpdateOnFiber(
-            root,
-            current,
-            attemptHydrationAtLane,
-            eventTime,
-          );
+          scheduleUpdateOnFiber(root, current, attemptHydrationAtLane);
 
           // Throw a special object that signals to the work loop that it should
           // interrupt the current render.
diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.js b/packages/react-reconciler/src/ReactFiberClassComponent.js
index 7aa3d934f3b12..b071808a9117d 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.js
@@ -64,11 +64,7 @@ import {
   emptyContextObject,
 } from './ReactFiberContext';
 import {readContext, checkIfContextChanged} from './ReactFiberNewContext';
-import {
-  requestEventTime,
-  requestUpdateLane,
-  scheduleUpdateOnFiber,
-} from './ReactFiberWorkLoop';
+import {requestUpdateLane, scheduleUpdateOnFiber} from './ReactFiberWorkLoop';
 import {logForceUpdateScheduled, logStateUpdateScheduled} from './DebugTracing';
 import {
   markForceUpdateScheduled,
@@ -213,8 +209,7 @@ const classComponentUpdater = {
 
     const root = enqueueUpdate(fiber, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitions(root, fiber, lane);
     }
 
@@ -248,8 +243,7 @@ const classComponentUpdater = {
 
     const root = enqueueUpdate(fiber, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitions(root, fiber, lane);
     }
 
@@ -283,8 +277,7 @@ const classComponentUpdater = {
 
     const root = enqueueUpdate(fiber, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitions(root, fiber, lane);
     }
 
diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.js b/packages/react-reconciler/src/ReactFiberCommitWork.js
index 9ea1d95796267..b540929ce0352 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.js
@@ -18,7 +18,7 @@ import type {
 } from './ReactFiberConfig';
 import type {Fiber, FiberRoot} from './ReactInternalTypes';
 import type {Lanes} from './ReactFiberLane';
-import {NoTimestamp, SyncLane} from './ReactFiberLane';
+import {SyncLane} from './ReactFiberLane';
 import type {SuspenseState, RetryQueue} from './ReactFiberSuspenseComponent';
 import type {UpdateQueue} from './ReactFiberClassUpdateQueue';
 import type {FunctionComponentUpdateQueue} from './ReactFiberHooks';
@@ -2415,7 +2415,7 @@ export function detachOffscreenInstance(instance: OffscreenInstance): void {
   const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
   if (root !== null) {
     instance._pendingVisibility |= OffscreenDetached;
-    scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+    scheduleUpdateOnFiber(root, fiber, SyncLane);
   }
 }
 
@@ -2435,7 +2435,7 @@ export function attachOffscreenInstance(instance: OffscreenInstance): void {
   const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
   if (root !== null) {
     instance._pendingVisibility &= ~OffscreenDetached;
-    scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+    scheduleUpdateOnFiber(root, fiber, SyncLane);
   }
 }
 
diff --git a/packages/react-reconciler/src/ReactFiberHooks.js b/packages/react-reconciler/src/ReactFiberHooks.js
index 369a662cb61b1..4be1994114a32 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.js
@@ -70,7 +70,6 @@ import {
   isTransitionLane,
   markRootEntangled,
   markRootMutableRead,
-  NoTimestamp,
 } from './ReactFiberLane';
 import {
   ContinuousEventPriority,
@@ -101,7 +100,6 @@ import {
   getWorkInProgressRootRenderLanes,
   scheduleUpdateOnFiber,
   requestUpdateLane,
-  requestEventTime,
   markSkippedUpdateLanes,
   isInvalidExecutionContextForEventFunction,
 } from './ReactFiberWorkLoop';
@@ -1837,7 +1835,7 @@ function checkIfSnapshotChanged<T>(inst: StoreInstance<T>): boolean {
 function forceStoreRerender(fiber: Fiber) {
   const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
   if (root !== null) {
-    scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+    scheduleUpdateOnFiber(root, fiber, SyncLane);
   }
 }
 
@@ -2558,8 +2556,7 @@ function refreshCache<T>(fiber: Fiber, seedKey: ?() => T, seedValue: T): void {
         const refreshUpdate = createLegacyQueueUpdate(lane);
         const root = enqueueLegacyQueueUpdate(provider, refreshUpdate, lane);
         if (root !== null) {
-          const eventTime = requestEventTime();
-          scheduleUpdateOnFiber(root, provider, lane, eventTime);
+          scheduleUpdateOnFiber(root, provider, lane);
           entangleLegacyQueueTransitions(root, provider, lane);
         }
 
@@ -2623,8 +2620,7 @@ function dispatchReducerAction<S, A>(
   } else {
     const root = enqueueConcurrentHookUpdate(fiber, queue, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitionUpdate(root, queue, lane);
     }
   }
@@ -2706,8 +2702,7 @@ function dispatchSetState<S, A>(
 
     const root = enqueueConcurrentHookUpdate(fiber, queue, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitionUpdate(root, queue, lane);
     }
   }
diff --git a/packages/react-reconciler/src/ReactFiberHotReloading.js b/packages/react-reconciler/src/ReactFiberHotReloading.js
index ffb3ae8a0ee1b..3bc3755bb957a 100644
--- a/packages/react-reconciler/src/ReactFiberHotReloading.js
+++ b/packages/react-reconciler/src/ReactFiberHotReloading.js
@@ -23,7 +23,7 @@ import {
 import {enqueueConcurrentRenderForLane} from './ReactFiberConcurrentUpdates';
 import {updateContainer} from './ReactFiberReconciler';
 import {emptyContextObject} from './ReactFiberContext';
-import {SyncLane, NoTimestamp} from './ReactFiberLane';
+import {SyncLane} from './ReactFiberLane';
 import {
   ClassComponent,
   FunctionComponent,
@@ -328,7 +328,7 @@ function scheduleFibersWithFamiliesRecursively(
     if (needsRemount || needsRender) {
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
     if (child !== null && !needsRemount) {
diff --git a/packages/react-reconciler/src/ReactFiberLane.js b/packages/react-reconciler/src/ReactFiberLane.js
index 45c8810c7f477..835bf01193423 100644
--- a/packages/react-reconciler/src/ReactFiberLane.js
+++ b/packages/react-reconciler/src/ReactFiberLane.js
@@ -319,25 +319,6 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
   return nextLanes;
 }
 
-export function getMostRecentEventTime(root: FiberRoot, lanes: Lanes): number {
-  const eventTimes = root.eventTimes;
-
-  let mostRecentEventTime = NoTimestamp;
-  while (lanes > 0) {
-    const index = pickArbitraryLaneIndex(lanes);
-    const lane = 1 << index;
-
-    const eventTime = eventTimes[index];
-    if (eventTime > mostRecentEventTime) {
-      mostRecentEventTime = eventTime;
-    }
-
-    lanes &= ~lane;
-  }
-
-  return mostRecentEventTime;
-}
-
 function computeExpirationTime(lane: Lane, currentTime: number) {
   switch (lane) {
     case SyncHydrationLane:
@@ -599,11 +580,7 @@ export function createLaneMap<T>(initial: T): LaneMap<T> {
   return laneMap;
 }
 
-export function markRootUpdated(
-  root: FiberRoot,
-  updateLane: Lane,
-  eventTime: number,
-) {
+export function markRootUpdated(root: FiberRoot, updateLane: Lane) {
   root.pendingLanes |= updateLane;
 
   // If there are any suspended transitions, it's possible this new update
@@ -622,12 +599,6 @@ export function markRootUpdated(
     root.suspendedLanes = NoLanes;
     root.pingedLanes = NoLanes;
   }
-
-  const eventTimes = root.eventTimes;
-  const index = laneToIndex(updateLane);
-  // We can always overwrite an existing timestamp because we prefer the most
-  // recent event, and we assume time is monotonically increasing.
-  eventTimes[index] = eventTime;
 }
 
 export function markRootSuspended(root: FiberRoot, suspendedLanes: Lanes) {
@@ -672,7 +643,6 @@ export function markRootFinished(root: FiberRoot, remainingLanes: Lanes) {
   root.errorRecoveryDisabledLanes &= remainingLanes;
 
   const entanglements = root.entanglements;
-  const eventTimes = root.eventTimes;
   const expirationTimes = root.expirationTimes;
   const hiddenUpdates = root.hiddenUpdates;
 
@@ -683,7 +653,6 @@ export function markRootFinished(root: FiberRoot, remainingLanes: Lanes) {
     const lane = 1 << index;
 
     entanglements[index] = NoLanes;
-    eventTimes[index] = NoTimestamp;
     expirationTimes[index] = NoTimestamp;
 
     const hiddenUpdatesForLane = hiddenUpdates[index];
diff --git a/packages/react-reconciler/src/ReactFiberReconciler.js b/packages/react-reconciler/src/ReactFiberReconciler.js
index 5ac1ecaa4ea74..72e020f945c64 100644
--- a/packages/react-reconciler/src/ReactFiberReconciler.js
+++ b/packages/react-reconciler/src/ReactFiberReconciler.js
@@ -56,7 +56,6 @@ import {
   onScheduleRoot,
 } from './ReactFiberDevToolsHook';
 import {
-  requestEventTime,
   requestUpdateLane,
   scheduleUpdateOnFiber,
   scheduleInitialHydrationOnRoot,
@@ -84,7 +83,6 @@ import {StrictLegacyMode} from './ReactTypeOfMode';
 import {
   SyncLane,
   SelectiveHydrationLane,
-  NoTimestamp,
   getHighestPriorityPendingLanes,
   higherPriorityLane,
 } from './ReactFiberLane';
@@ -311,9 +309,8 @@ export function createHydrationContainer(
   const update = createUpdate(lane);
   update.callback =
     callback !== undefined && callback !== null ? callback : null;
-  const eventTime = requestEventTime();
   enqueueUpdate(current, update, lane);
-  scheduleInitialHydrationOnRoot(root, lane, eventTime);
+  scheduleInitialHydrationOnRoot(root, lane);
 
   return root;
 }
@@ -379,8 +376,7 @@ export function updateContainer(
 
   const root = enqueueUpdate(current, update, lane);
   if (root !== null) {
-    const eventTime = requestEventTime();
-    scheduleUpdateOnFiber(root, current, lane, eventTime);
+    scheduleUpdateOnFiber(root, current, lane);
     entangleTransitions(root, current, lane);
   }
 
@@ -427,8 +423,7 @@ export function attemptSynchronousHydration(fiber: Fiber): void {
       flushSync(() => {
         const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
         if (root !== null) {
-          const eventTime = requestEventTime();
-          scheduleUpdateOnFiber(root, fiber, SyncLane, eventTime);
+          scheduleUpdateOnFiber(root, fiber, SyncLane);
         }
       });
       // If we're still blocked after this, we need to increase
@@ -471,8 +466,7 @@ export function attemptContinuousHydration(fiber: Fiber): void {
   const lane = SelectiveHydrationLane;
   const root = enqueueConcurrentRenderForLane(fiber, lane);
   if (root !== null) {
-    const eventTime = requestEventTime();
-    scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+    scheduleUpdateOnFiber(root, fiber, lane);
   }
   markRetryLaneIfNotHydrated(fiber, lane);
 }
@@ -486,8 +480,7 @@ export function attemptHydrationAtCurrentPriority(fiber: Fiber): void {
   const lane = requestUpdateLane(fiber);
   const root = enqueueConcurrentRenderForLane(fiber, lane);
   if (root !== null) {
-    const eventTime = requestEventTime();
-    scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+    scheduleUpdateOnFiber(root, fiber, lane);
   }
   markRetryLaneIfNotHydrated(fiber, lane);
 }
@@ -666,7 +659,7 @@ if (__DEV__) {
 
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
   };
@@ -690,7 +683,7 @@ if (__DEV__) {
 
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
   };
@@ -715,7 +708,7 @@ if (__DEV__) {
 
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
   };
@@ -728,7 +721,7 @@ if (__DEV__) {
     }
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
   overridePropsDeletePath = (fiber: Fiber, path: Array<string | number>) => {
@@ -738,7 +731,7 @@ if (__DEV__) {
     }
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
   overridePropsRenamePath = (
@@ -752,14 +745,14 @@ if (__DEV__) {
     }
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
 
   scheduleUpdate = (fiber: Fiber) => {
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
 
diff --git a/packages/react-reconciler/src/ReactFiberRoot.js b/packages/react-reconciler/src/ReactFiberRoot.js
index 35daaf7c10dc4..7fd4802d0cc79 100644
--- a/packages/react-reconciler/src/ReactFiberRoot.js
+++ b/packages/react-reconciler/src/ReactFiberRoot.js
@@ -66,7 +66,6 @@ function FiberRootNode(
   this.next = null;
   this.callbackNode = null;
   this.callbackPriority = NoLane;
-  this.eventTimes = createLaneMap(NoLanes);
   this.expirationTimes = createLaneMap(NoTimestamp);
 
   this.pendingLanes = NoLanes;
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.js b/packages/react-reconciler/src/ReactFiberWorkLoop.js
index d75cc2c47ff15..6f00533d3004d 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.js
@@ -130,7 +130,6 @@ import {
   NoLanes,
   NoLane,
   SyncLane,
-  NoTimestamp,
   claimNextTransitionLane,
   claimNextRetryLane,
   includesSyncLane,
@@ -584,10 +583,6 @@ const NESTED_PASSIVE_UPDATE_LIMIT = 50;
 let nestedPassiveUpdateCount: number = 0;
 let rootWithPassiveNestedUpdates: FiberRoot | null = null;
 
-// If two updates are scheduled within the same event, we should treat their
-// event times as simultaneous, even if the actual clock time has advanced
-// between the first and second call.
-let currentEventTime: number = NoTimestamp;
 let currentEventTransitionLane: Lanes = NoLanes;
 
 let isRunningInsertionEffect = false;
@@ -604,21 +599,6 @@ export function isWorkLoopSuspendedOnData(): boolean {
   return workInProgressSuspendedReason === SuspendedOnData;
 }
 
-export function requestEventTime(): number {
-  if ((executionContext & (RenderContext | CommitContext)) !== NoContext) {
-    // We're inside React, so it's fine to read the actual time.
-    return now();
-  }
-  // We're not inside React, so we may be in the middle of a browser event.
-  if (currentEventTime !== NoTimestamp) {
-    // Use the same start time for all updates until we enter React again.
-    return currentEventTime;
-  }
-  // This is the first update since React yielded. Compute a new start time.
-  currentEventTime = now();
-  return currentEventTime;
-}
-
 export function getCurrentTime(): number {
   return now();
 }
@@ -707,7 +687,6 @@ export function scheduleUpdateOnFiber(
   root: FiberRoot,
   fiber: Fiber,
   lane: Lane,
-  eventTime: number,
 ) {
   if (__DEV__) {
     if (isRunningInsertionEffect) {
@@ -737,7 +716,7 @@ export function scheduleUpdateOnFiber(
   }
 
   // Mark that the root has a pending update.
-  markRootUpdated(root, lane, eventTime);
+  markRootUpdated(root, lane);
 
   if (
     (executionContext & RenderContext) !== NoLanes &&
@@ -838,11 +817,7 @@ export function scheduleUpdateOnFiber(
   }
 }
 
-export function scheduleInitialHydrationOnRoot(
-  root: FiberRoot,
-  lane: Lane,
-  eventTime: number,
-) {
+export function scheduleInitialHydrationOnRoot(root: FiberRoot, lane: Lane) {
   // This is a special fork of scheduleUpdateOnFiber that is only used to
   // schedule the initial hydration of a root that has just been created. Most
   // of the stuff in scheduleUpdateOnFiber can be skipped.
@@ -854,7 +829,7 @@ export function scheduleInitialHydrationOnRoot(
   // match what was rendered on the server.
   const current = root.current;
   current.lanes = lane;
-  markRootUpdated(root, lane, eventTime);
+  markRootUpdated(root, lane);
   ensureRootIsScheduled(root);
 }
 
@@ -874,9 +849,6 @@ export function performConcurrentWorkOnRoot(
     resetNestedUpdateFlag();
   }
 
-  // Since we know we're in a React event, we can clear the current
-  // event time. The next update will compute a new event time.
-  currentEventTime = NoTimestamp;
   currentEventTransitionLane = NoLanes;
 
   if ((executionContext & (RenderContext | CommitContext)) !== NoContext) {
@@ -3313,9 +3285,8 @@ function captureCommitPhaseErrorOnRoot(
   const errorInfo = createCapturedValueAtFiber(error, sourceFiber);
   const update = createRootErrorUpdate(rootFiber, errorInfo, (SyncLane: Lane));
   const root = enqueueUpdate(rootFiber, update, (SyncLane: Lane));
-  const eventTime = requestEventTime();
   if (root !== null) {
-    markRootUpdated(root, SyncLane, eventTime);
+    markRootUpdated(root, SyncLane);
     ensureRootIsScheduled(root);
   }
 }
@@ -3356,9 +3327,8 @@ export function captureCommitPhaseError(
           (SyncLane: Lane),
         );
         const root = enqueueUpdate(fiber, update, (SyncLane: Lane));
-        const eventTime = requestEventTime();
         if (root !== null) {
-          markRootUpdated(root, SyncLane, eventTime);
+          markRootUpdated(root, SyncLane);
           ensureRootIsScheduled(root);
         }
         return;
@@ -3493,10 +3463,9 @@ function retryTimedOutBoundary(boundaryFiber: Fiber, retryLane: Lane) {
     retryLane = requestRetryLane(boundaryFiber);
   }
   // TODO: Special case idle priority?
-  const eventTime = requestEventTime();
   const root = enqueueConcurrentRenderForLane(boundaryFiber, retryLane);
   if (root !== null) {
-    markRootUpdated(root, retryLane, eventTime);
+    markRootUpdated(root, retryLane);
     ensureRootIsScheduled(root);
   }
 }
diff --git a/packages/react-reconciler/src/ReactInternalTypes.js b/packages/react-reconciler/src/ReactInternalTypes.js
index c7264083172f0..281186c53de0d 100644
--- a/packages/react-reconciler/src/ReactInternalTypes.js
+++ b/packages/react-reconciler/src/ReactInternalTypes.js
@@ -248,7 +248,6 @@ type BaseFiberRootProperties = {
   // task that the root will work on.
   callbackNode: any,
   callbackPriority: Lane,
-  eventTimes: LaneMap<number>,
   expirationTimes: LaneMap<number>,
   hiddenUpdates: LaneMap<Array<ConcurrentUpdate> | null>,