Cursor IDE CPU spikes

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

cursor IDE spikes the CPU constantly with no apparent reason.

Steps to Reproduce

just work with agent , no extension is building, IDE should stay idle, but it spikes cpu

Expected Behavior

Make the ide usable. Its completely unresponsive very frequently

Screenshots / Screen Recordings

Operating System

Linux

Version Information

Version: 2.6.18
VSCode Version: 1.105.1
Commit: 68fbec5aed9da587d1c6a64172792f505bafa250
Date: 2026-03-10T02:01:17.430Z
Build Type: Stable
Release Track: Default
Electron: 39.6.0
Chromium: 142.0.7444.265
Node.js: 22.22.0
V8: 14.2.231.22-electron.0
OS: Linux x64 6.19.6-x64v3-xanmod1

For AI issues: which model did you use?

Composer 1.5 (or composer 1 or auto)

Additional Information

Most probably its the UI (zygote) process. I have tried both with GPU acceleration on and off.

Does this stop you from using Cursor

Yes - Cursor is unusable

[Colin]

Hi there!

Thanks for the report! This aligns with some other performance issues we’re tracking.

To help us narrow down the cause, could you try the following?

1. Update to Cursor 2.6.19
2. Try and reproduce the high CPU usage
3. Run Developer: Open Process Explorer (from the Command Palette) and share a screenshot while CPU is elevated
4. Open Help > Toggle Developer Tools → Console tab and check for any ListenerLeak or listener warning messages

This will help us confirm whether you’re hitting the same renderer-listener leak we’ve seen elsewhere, or something different!

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

Hello, upgraded

Can’t really seem to reproduce it now.
Seems fixed.

I will monitor throughout the day and report back if it occurs again

thank you very much for your swift response and support!

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

hello, unfortunately the issue is now back in version 2.6.20

No listenerLeak issues seen in the dev tools though

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

Characteristically I am typing in plan/agent chat and the cpu peeks hanging the whole pc unable to type any more. After a 5-10 sec it drops again

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

As well as while the agent is working it again hits very high usage and never drops

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

this may also help, I seem to have issues under 2.6.19 as well.

They seem to be related to my 3 screen setup possibly…I just mention this since I didnt face such huge problems in a single screen setup with 2.6.19. But now in my 3 screen its a lot more apparent

[Colin]

Thanks for the follow-up @Giorgos_Theodoropoul!

1. I can see that you have a couple of extensions installed. Could you try running Cursor with extensions disabled (cursor --disable-extensions) and start a chat with the agent? Would be helpful to rule out any extension-related issues!
2. If you click over to History (CPU) you can find exactly which process spiked CPU at the time Cursor froze up. That would be really helpful as well!

[Giorgos_Theodoropoul (Giorgos Theodoropoulos)]

Hello again Colin, thank you so much for your guidance.

As it turns out

What is spiking is the Java extension although I could not see it clearly on the live monitor.
I will try to check whether I can bypass this issue by altering any setting related to that. I can’t really disable it.