There seems to be some weird bug plaguing any driver above 465.xx, if you have “Allow Flipping” set to on the entire KWIN session starts to lag every time you open settings or a browser or something in general. Disabling flipping will fix the desktop, but then stuff like GSync and ForceCompositionPipeline wouldn’t work which isn’t ideal solution…
EDIT: It seems like I am not the only one experiencing this - https://www.reddit.com/r/EndeavourOS/comments/p8b2kf/for_those_that_have_stutterlags_problems_with_kde/
You will normally see a change in mouse stutter and your cursor should not "skip" frames when launching apps. that’s the kind of frameskip/framedrop that’s happening.