High CPU Usage on Cursor (macOS)

Describe the Bug

Opened cursor, open 3 files, Python code, move cursor to the background and minimize window, checked activity monitor, high CPU usage.

Steps to Reproduce

Open cursor, open any python file (1500 lines), look at it, minimize cursor, check activity monitor

Expected Behavior

CPU usage to ramp down (although the current ramp up is unexpected as no tasks were being performed)

Screenshots / Screen Recordings

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.3.9 (Universal)
VSCode Version: 1.99.3
Commit: 54c27320fab08c9f5dd5873f07fca101f7a3e070
Date: 2025-08-01T20:27:38.378Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.6.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

Hey, this issue might be related to some extensions. Open Process Explorer within Cursor and check what is excessively consuming resources. Also, try launching Cursor with the flag cursor --disable-extensions.

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

I concur, single core overuse stems from electron VScode, the ‘extension host’ runs all installed extensions in a separate process from file watcher and search processes etc. As such, this isolation can end up with 100% single core cpu usage when one specific, single threaded process becomes overwhelmed.

And it occurs mostly in linting but also sneaky background extensions running telemetry, file indexing etc. Extension can conflict or poorly optimized extensions can be culprits.

Sorry there’s no iExtension you can buy €700 on the apple store :confused: