Yes, I also experienced this with my 2020 MBA after updating to Big Sur (via a clean install). Scrolling with the trackpad in Safari was especially terrible at first with jitter and the appearance of dropped frames. This seems to be better the last couple of days for me. It's still not as smooth as it was with Catalina.

Thanks for mentioning that you did a clean install and still experienced the same issue. I did the normal upgrade procedure and was considering doing a clean install but now I see that will be a waste of time. Hopefully this will be something Apple fixes in a point release.

Strangely enough, scrolling has improved for me in many apps with my trackball on Big Sur. Scrolling in Messages used to be very difficult to do accurately; now, it works just like Safari.

I haven't tried a touchpad yet, so I wouldn't be surprised if your experience holds true as well.

> Scrolling in Messages used to be very difficult to do accurately

This, the improved search and threads in the Messages app were the main reasons for me to upgrade. The old "webview" Messages that was abandoned for many years very desperately needed that rewrite. It's not perfect right now but it's already way better and it would make sense for it to get more iterations now.

Especially jittery on notification center for me.