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New standalone debugger in 0.83 way too slow / laggy #54889

@alexkey89

Description

@alexkey89

Description

The standalone debugger in latest RN 0.83 is way too slow / laggy which makes it impossible to debug.

Steps to reproduce

  • Simply create a new react native app (non-expo)
  • Try debug it by pressing j on terminal
    It will open up the standalone debugger tool but then we have to wait a good 1-2minutes until its responsive
    It's also slow in showing the logs whilst testing on a real device. Way slower than before

React Native Version

0.83.0

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

System:
  OS: macOS 15.6.1
  CPU: (14) x64 Apple M4 Pro
  Memory: 2.20 GB / 48.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.13.1
npm:
    version: 10.9.2
Managers:
  CocoaPods:
    version: 1.16.2
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.1
      - iOS 26.1
      - macOS 26.1
      - tvOS 26.1
      - visionOS 26.1
      - watchOS 26.1
  Android SDK: Not Found
Languages:
  Java:
    version: 17.0.10
Ruby:
    version: 3.2.2
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.2.0
    wanted: 19.2.0
  react-native:
    installed: 0.83.0
    wanted: 0.83.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

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    DebuggingIssues related to React Native DevTools or legacy JavaScript/Hermes debuggingNeeds: Author FeedbackNeeds: ReproThis issue could be improved with a clear list of steps to reproduce the issue.

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