Hello! I have 2019 iMac 27 with 24GB ram, and i have upgraded to macOS Bigsur yesterday and it's slowed my mac totally! It need about 10 years to startup system, about 4 seconds to startup safari. But in safari, when browsing, everything is smooth and super fast like usual. Just think there will be another update very soon to fix this problems with starting up.
simad4sx
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Cuprija, Serbia