First of all the specs:
Macbook M2 Pro 16gb - OS: macOS 26.0.1 25A362 arm64
Was using v1.7 just fine till today when I was prompt to update as my version was too old, so I did it, only to face a poor performance on v2.1 (switched to v2.0 later but was the same). There was a lot of lag and stutter when scrolling on both the Editor pane and the Secondary sidebar (Chat/Agent), also tried disable all extensions and cursor --disable-extensions but the problem persist. Got back to v1.7 where everything is fast and zero performance issues.
Steps to Reproduce
Just compare the performance when scrolling through a medium sized file, and a normal interaction with Cursor agent mode between v2.1 and v1.7 using a ARM Macbook.
Operating System
MacOS
Current Cursor Version (Menu → About Cursor → Copy)
Hey, thanks for the report. Similar performance issues were reported in nightly v2.1 builds and were fixed there. Let’s collect a bit of diagnostic info to understand what’s happening in your case:
Quick diagnostics:
Open Activity Monitor (Applications → Utilities), sort by CPU, and share a screenshot showing all Cursor processes when the lag happens.
In Cursor v2.1.x, press CMD+Shift+P → run “Developer: Open Process Explorer” and share a screenshot of that too.
Which exact v2.1 build were you using? If you can briefly reinstall v2.1, please copy the version from Menu → About Cursor.
It would also be helpful to know:
Does the slowdown start right away, or does it build up over time?
Does scrolling lag in all files or only in larger ones?
This will help us see whether it’s tied to a specific process or to the renderer.
I experienced similar issues. I have downloaded latest version and installed in over old version. After closer look I had in Applications folder Cursor app dated at 1980 and Intel based. Had to remove it first and install again. Solved for me.