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we have no choice, we have to love Big Sur, because Mojave will be out of support very soon in this Oct or Nov.
 
Despite still running Tiger on a G4 ibook for a network task, illustrating my respect for old hard & software, BS runs fine on my MBP i9 16" 2019.

I'm very wary of new OS and update releases and tend not to be an early adopter, but I bit the bullet with BS, love it.

Those moaning should format & clean install,test then install your apps etc one at a time, testing each time - you may identify the culprit.

If it's knackered after a fresh install you likely have a hardware issue.
 
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we have no choice, we have to love Big Sur, because Mojave will be out of support very soon in this Oct or Nov.
Catalina can still be an option, although not as solid as Mojave. I am back using Catalina and very happy, after few months trying to adjust myself to like Big Sur.
 
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