onUserDrivenAnimationEnded: when ending scrolling, all Animated.Views re-render, which makes the app unresponsive

[tomvankruijsbergen]

Description

On ending scrolling, onUserDrivenAnimationEnded is triggered on every Animated.View, which causes them all to re-render. On apps with more complex views such as ours, that results in 200+ re-renders that are not useful, and the mqtjs thread is 100% full, which makes the app fully unresponsive while those re-renders are happening.

If I comment this line out, the app is performant again, but ofcourse this line is there for a reason, so I don't know which bugs I am now inviting to the app. What is the proper fix? Or can we somehow prevent most of the views from re-rendering through some logic?

Related: #36504 (comment)

Steps to reproduce

1. Run the snack.
2. Scroll a bit, then try to tap any of the squares.
3. See that this either is very delayed, or doesn't happen at all.
4. In profiling, see that all components re-render.

Note: this is much, much more pronounced on Android.

Notes on the Snack:

• If you remove the Animated.Event from the animated scroll view, the problem disappears.
• If you remove the scaleA animation, which is there as an example animation, the problem disappears.
• TouchableOpacity is just there to have a pressable Animated.View; the problem also happens if these are plain Animated.View.

React Native Version

0.80.2

Affected Platforms

Runtime - Android, Runtime - iOS, Build - MacOS

Areas

Fabric - The New Renderer

Output of npx @react-native-community/cli info

System:
  OS: macOS 14.4.1
  CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
  Memory: 1.73 GB / 32.00 GB
  Shell:
    version: 3.7.1
    path: /usr/local/bin/fish
Binaries:
  Node:
    version: 20.13.1
    path: /usr/local/bin/node
  Yarn:
    version: 1.22.22
    path: /usr/local/bin/yarn
  npm:
    version: 10.5.2
    path: /usr/local/bin/npm
  Watchman:
    version: 2025.06.23.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.14.3
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.4
      - iOS 17.4
      - macOS 14.4
      - tvOS 17.4
      - visionOS 1.1
      - watchOS 10.4
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.3 AI-233.14808.21.2331.11842104
  Xcode:
    version: 15.3/15E204a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 19.1.1
    wanted: 19.1.1
  react:
    installed: 19.1.0
    wanted: 19.1.0
  react-native:
    installed: 0.80.2
    wanted: 0.80.2
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

See description!

MANDATORY Reproducer

https://snack.expo.dev/@tomvankruijsbergen/rn-animatedvalue

Screenshots and Videos

No response

[react-native-bot]

Warning

Unsupported version: It looks like your issue or the example you provided uses an unsupported version of React Native.

Due to the number of issues we receive, we're currently only accepting new issues against one of the supported versions. Please upgrade to latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If you cannot upgrade, please open your issue on StackOverflow to get further community support.

[react-native-bot]

Warning

Unsupported version: It looks like your issue or the example you provided uses an unsupported version of React Native.

Due to the number of issues we receive, we're currently only accepting new issues against one of the supported versions. Please upgrade to latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If you cannot upgrade, please open your issue on StackOverflow to get further community support.

[react-native-bot]

This issue is waiting for author's feedback since 24 days. Please provide the requested feedback or this will be closed in 7 days.