Cursor 3 Editor window resizing is laggy

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I’ve noticed since I updated to Cursor 3 (from 2.x), resizing the Editor window is noticeably laggy and drops frames big time.

It seems to get worse when the window size is on the smaller side. It doesn’t matter whether files are open or not, even with nothing open, only the Explorer sidebar shown with an empty main content area, I see jank as I size the window down.

Steps to Reproduce

  1. Open Cursor 3.x
  2. Keep your files open, or close them all, doesn’t matter
  3. Resize your editor window
  4. Witness extreme jank

Expected Behavior

Cursor window resizes smoothly regardless of contents

Operating System

MacOS

Version Information

Version: 3.0.12
VSCode Version: 1.105.1
Commit: a80ff7dfcaa45d7750f6e30be457261379c29b00
Date: 2026-04-04T00:13:18.452Z
Layout: editor
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Darwin arm64 25.4.0

Additional Information

MacBook Pro - M4 Pro - 48GB
Tahoe 26.4

Does this stop you from using Cursor

No - Cursor works, but with this issue

4

Hey, thanks for the report.

A couple questions to help with diagnosis:

  • Can you record a short screen recording showing the lag during resize? That would really help the team.
  • Have you tried launching with cursor --disable-extensions? We want to rule out extensions.
  • Also try: Cmd+Shift+P → Developer: Open Process Explorer, and see if anything looks unusual with CPU during resize.

Let me know how it goes.