Cursor saturates 3 CPU cores when idle (M2 Apple)

[panicfarm]

Describe the Bug

Cursor saturates 3 M2 cores simply by being open, after an agentic session. 300% CPU total

Steps to Reproduce

I am not executing anything. Cursor is simply open and on my Macbook M2 it saturates 3 CPU cores (300% CPU total). The laptop is hot. When I quit Cursor and restart, the CPU drops to negligible.

Screenshots / Screen Recordings

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.3.9
VSCode Version: 1.99.3
Commit: 54c27320fab08c9f5dd5873f07fca101f7a3e070
Date: 2025-08-01T20:07:18.002Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.5.0

[haris-musa (Haris)]

Something going on with Windows also, a bit laggy ever since vscode version was updated

It has got better in recent updates

It starts smooth, but over time gets laggy. So, there is memory leak I guess

[deanrie]

Hey, it’s possible that some process is excessively consuming your CPU/RAM resources. Could you check which processes are being used while Cursor is running?

Start by checking the built-in Activity Monitor, then use Process Explorer in Cursor itself. There’s also a chance the issue might be related to one or more extensions, so try launching with the flag cursor --disable-extensions. The issue might also be related to the specifics of the project, have you tried checking this in other projects?

It would be great if you could share the info and screenshots of the processes used.

[panicfarm]

It’s a very rare bug, I have not been able to reporoduce it since I updated to 1.4.x