Big Sur is a nightmare for me, too. I have a mac mini with i7 6Core and 64GB RAM. Every OS animation is laggy and slow (like 5 fps), expecially for quicklook in finder, unusable.
I tried to install catalina on an external disk and all works fast and smooth like butter. Then, tried to install Big Sur 11.2 Beta 2 on external disk, too, and problem persists.
There is nothing worse than a disappointed Apple user.
Steve Jobs, we miss you!
tastopesato
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