Ridiculously slow and laggy interface
I almost can't work in it. Third party effects are useless and the overall responsiveness of After Effects 202 is terrible. If I didn't keep getting the ridiculous drawing error in the 2019 version, I'd be using it. You HAVE to fix this issue fast. Your application is almost useless right now. People are going to switch. Right now, I totally regret upgrading to CC 2020.

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Lasse Gjertsen commented
Same here. Switched from a 1080p to 4K secondary screen, to keep the timeline on. Doing character animation with Shape Layers. Simply viewing many keyframes makes the whole program lag, especially when zooming in and out on the timeline. Selecting many keyframes increases the lag exponentially.
BUT when selecting only one keyframe/one path the lag magically disappears and I can scrub the timeline more or less smoothly. What the hell is going on here?
The timeline also starts lagging when viewing the Waveform of a single Audio clip/layer.
Adobe, please fix these basic performance issues/BUGS before adding more 3D-features and etc. My workflow is seriously impaired because of this. If I could switch to another software I would do so instantly, but I'm stuck with this animation style midway in a 3 year project. Could as well have done this hand drawn, it would probably go faster...
Working in a 1-3 fps User Interface because the software struggles with viewing dots on a screen on a high end workstation in 2021 is completely unacceptable, ridiculous and extremely frustrating. Come on!
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Amir Stone commented
So sorry you're experiencing responsiveness issues. Can we get a little more details about when you're experiencing this problem? Do you have many (hundreds or thousands) of layers in your composition?
If so we may have a fix for you. Could you try out the latest AE Beta and see if it behaves better for your use cases?
If not, we'd love more details about your setup and use cases in order to diagnose and fix it.