macOS overall slow UI when running (Adobe?) apps
okay, today I tried to solve this with a hint from the Adobe forums: some people said the performance gets significantly better when using the colour profile &quot;apple RGB&quot; for all attached monitors (instead of using &quot;iMac&quot; or some real colour profile from a calibration tool).
and indeed, that worked, I can now have InDesign or acrobat open and still use a browser or finder or text editor without spinning wheels. this seems to be Catalina+cc2020 only, every other combination seems to work with profiles.
it's no real solution as I need profiling and color management, but at least I've found the cause.
Who is the culprit is hard to tell - apple changing color management methods (64bit? other layer in the display stack?) or Adobe not able to cope with it after now 8 months of CC2020 on Catalina ...
Adobe forums thread: https://community.adobe.com/t5/indesign/inddesign-2020-slow-performance-on-macos-catalina-10-15-1/td-p/10715300?page=1