Yeah i'm wondering too. Is Apple ever gonna address this? I won't upgrade to Big Sur until i'm sure it won't slow down my iMac again.
lazyzeroed
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iMac (Retina 4K, 21.5-inch, 2019)
3,2GHz 6-Core i7
32GB DDR4
My iMac worked fine after the first reboot, except that I could not watch anything on Netflix or on any other streaming service anymore (the screen just went blank after a few seconds, but the sound was still working), but it works with Chrome.
And after today's boot it's SO damn slow! It took several minutes until I could open any apps and Safari crashed multiple times.
Fix this, Apple!!