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An error occurred while saving the commentSeth Short commented
FYI I found that the Windows system's display "Scale and Layout" is causing the issue for me. If I set (in Display settings) the Scale to 100%, After Effects works like butter. If it's at 125% (which I'm more comfortable with), all the glitches mentioned in this post appear. At 150% scaling, I'm still getting a little lag but not as nice as 100%.
So, as long as you don't mind squinting 6 inches from your screen, problem solved?
Also... if you set the Scale to 100%, open AE, and then change the scale without closing/reopening AE, the interaction stays very smooth... but the UI is blurry. It's definitely an issue with AE's scaling to various resolutions.
Turning off the "Advanced scaling" > "Fix scaling for apps" doesn't work, FYI.