Cursor 2.2.36 is slow and laggy

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Cursor chat takes all of the CPU and GPU when create or update files.

Steps to Reproduce

Ask agent to write some code or documentation, and then it stopped responding and became very slow.

Operating System

Windows 10/11
MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.2.36 and 2.3.21

Additional Information

2.0.77 works fine.

Does this stop you from using Cursor

Yes - Cursor is unusable

2

Hey, thanks for the report.

High CPU/GPU usage while the agent is running is often related to extensions. Let’s check:

  1. Extension Monitor: Settings > Application > Experimental and enable Extension Monitor Enabled, then CMD/CTRL + Shift + P > Developer: Open Extension Monitor and see which extensions are using the most resources.

  2. Test without extensions: Run cursor --disable-extensions from the command line and check if the issue still happens.

  3. Process Explorer: CMD/CTRL + Shift + P > Developer: Open Process Explorer and check which process is using resources, like extensionHost, ptyHost, etc.

If it still happens with extensions disabled, please send:

  • Screenshots from Process Explorer while it’s freezing
  • The Request ID from the affected session (Chat context menu > Copy Request ID)
  • Console logs (Help > Toggle Developer Tools > Console tab)

Let me know what you find from these tests.

3

Uninstall Cursor and delete everything in AppData/*cursor, works fine now.