27” IMAC 2017 is having same problem after installing Big Sur OS. Very slow operating and high level of frustration in waiting for the computer to respond. Spent 2 days on the phone with Apple Support without resolution. Last thing done was to reinstall Big Sur OS. This was done twice and did not resolve problem. Now Apple Support is recommending to back-up drive so it can be wiped clean and start over. Big lesson learned, I did not backup computer before the first download of Big Sur OS. Now they say there is no going back.
sverroc
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Charlotte, NC, United States