New standalone debugger in 0.83 way too slow / laggy

[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

Screenshots and Videos

No response

[react-native-bot]

[!WARNING] Missing reproducer: We could not detect a reproducible example in your issue report. Reproducers are mandatory and we can accept only one of those as a valid reproducer:

• For majority of bugs: send us a Pull Request with the RNTesterPlayground.js edited to reproduce your bug.
• If your bug is UI related: a Snack
• If your bug is build/upgrade related: a project using our Reproducer Template

You can read more about about it on our website: How to report a bug.

[migueldaipre]

Hello @alexkey89 , I have been testing the new debugger and have not experienced any lag.

Could you attach a reproducer and a video demonstrating the issue?

[cortinico]

Ditto to what @migueldaipre said. Without more information we would have to close this one @alexkey89