Click at 'plan' in chat - freezing screen

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Cursor Plan Window Freezing Issue

Summary

The Cursor plan window freezes completely for 30-40 seconds when opening any plan, causing the application to become unresponsive. The operating system detects the freeze and prompts the user to wait or force quit.

Environment

  • OS: macOS 15.6.1 (Build 24G90)
  • Cursor Version: (check via Help > About)
  • Project Size: 474MB, 575 files, 50,247 lines of code
  • Modified Files: 166 files in git status
  • Project Type: TypeScript/React with Supabase backend

Steps to Reproduce

  1. Open any plan in Cursor (either existing or newly created)
  2. Click on the plan in the plan sidebar
  3. The application freezes completely (no response to any clicks)
  4. After 30-40 seconds, the plan content appears
  5. During the freeze, macOS shows “Application not responding” dialog

Expected Behavior

The plan should open instantly (within 1-2 seconds) without freezing the application.

Actual Behavior

  • Complete application freeze for 30-40 seconds
  • Cursor Helper (Renderer) process uses 100%+ CPU during freeze
  • Memory usage spikes to ~1GB during freeze
  • Operating system detects unresponsiveness and prompts user

Troubleshooting Attempted

We have tried multiple troubleshooting steps without success:

  1. Database cleanup: Deleted composer and plan data from state.vscdb (reduced from 4.8MB to 72KB)
  2. AI Service data cleanup: Deleted aiService.prompts (1.2MB) and aiService.generations (56KB)
  3. Large records cleanup: Deleted all records >100KB from database
  4. Cache cleanup: Deleted CachedData (23MB) multiple times
  5. Images cleanup: Deleted images folder (25MB, 79 images)
  6. Settings modification: Modified diff editor settings:
    • diffEditor.maxComputationTime: 0 → 5000
    • diffEditor.maxFileSize: 10000
    • diffEditor.renderSideBySide: false
    • composer.diffTimeout: 5000
    • composer.enableDiff: false
    • composer.maxPlanSize: 1000
    • composer.enablePlanCaching: false

None of these steps resolved the issue.

System Information

  • Total CPU Usage: 118.7% (multiple cores)
  • Total Memory Usage: 10.7%
  • Large Files: 7 files with >1000 lines
  • Project Type: TypeScript/React project with Supabase backend

Console Errors

(To be checked in Developer Tools - please check for any errors when opening a plan)

Additional Notes

  • The issue occurs with even the simplest plans (20 lines)
  • The freeze happens regardless of plan complexity
  • The issue started recently (was working before)
  • The problem persists even after complete cache and database cleanup

Request

Please investigate why the plan window freezes when opening plans. This significantly impacts productivity as users cannot use the plan feature effectively.

Contact Information

Steps to Reproduce

Cursor Plan Window Freezing Issue

Summary

The Cursor plan window freezes completely for 30-40 seconds when opening any plan, causing the application to become unresponsive. The operating system detects the freeze and prompts the user to wait or force quit.

Environment

  • OS: macOS 15.6.1 (Build 24G90)
  • Cursor Version: (check via Help > About)
  • Project Size: 474MB, 575 files, 50,247 lines of code
  • Modified Files: 166 files in git status
  • Project Type: TypeScript/React with Supabase backend

Steps to Reproduce

  1. Open any plan in Cursor (either existing or newly created)
  2. Click on the plan in the plan sidebar
  3. The application freezes completely (no response to any clicks)
  4. After 30-40 seconds, the plan content appears
  5. During the freeze, macOS shows “Application not responding” dialog

Expected Behavior

The plan should open instantly (within 1-2 seconds) without freezing the application.

Actual Behavior

  • Complete application freeze for 30-40 seconds
  • Cursor Helper (Renderer) process uses 100%+ CPU during freeze
  • Memory usage spikes to ~1GB during freeze
  • Operating system detects unresponsiveness and prompts user

Troubleshooting Attempted

We have tried multiple troubleshooting steps without success:

  1. Database cleanup: Deleted composer and plan data from state.vscdb (reduced from 4.8MB to 72KB)
  2. AI Service data cleanup: Deleted aiService.prompts (1.2MB) and aiService.generations (56KB)
  3. Large records cleanup: Deleted all records >100KB from database
  4. Cache cleanup: Deleted CachedData (23MB) multiple times
  5. Images cleanup: Deleted images folder (25MB, 79 images)
  6. Settings modification: Modified diff editor settings:
    • diffEditor.maxComputationTime: 0 → 5000
    • diffEditor.maxFileSize: 10000
    • diffEditor.renderSideBySide: false
    • composer.diffTimeout: 5000
    • composer.enableDiff: false
    • composer.maxPlanSize: 1000
    • composer.enablePlanCaching: false

None of these steps resolved the issue.

System Information

  • Total CPU Usage: 118.7% (multiple cores)
  • Total Memory Usage: 10.7%
  • Large Files: 7 files with >1000 lines
  • Project Type: TypeScript/React project with Supabase backend

Console Errors

(To be checked in Developer Tools - please check for any errors when opening a plan)

Additional Notes

  • The issue occurs with even the simplest plans (20 lines)
  • The freeze happens regardless of plan complexity
  • The issue started recently (was working before)
  • The problem persists even after complete cache and database cleanup

Request

Please investigate why the plan window freezes when opening plans. This significantly impacts productivity as users cannot use the plan feature effectively.

Contact Information

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.1.25 (Universal)
VSCode Version: 1.105.1
Commit: 7584ea888f7eb7bf76c9873a8f71b28f034a9820
Date: 2025-11-23T04:45:23.529Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.6.0

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

2

Hey, thanks for the report. The 30-40 second freeze when opening plans looks similar to performance issues we’ve already seen in v2.0, especially with large projects and git status handling.

Could you help me gather some diagnostic info?

During the next freeze, please try:

  • Console errors: Help > Toggle Developer Tools > Console tab > screenshot any errors (especially when clicking a plan)
  • Process info: CMD+Shift+P > “Developer: Open Process Explorer” > take a screenshot during the actual freeze
  • Extensions check: run cursor --disable-extensions in your terminal and see if the freeze still happens

Let me know what you find.