It seems that this behavior is just related to certain questions, not to all. E.g. this one is not on my watch list: https://developer.apple.com/forums/thread/679098
Rumio
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I‘m also affected by this bug on a Mac mini i7, 2020 with 16 GB RAM.
The worst thing is the slow down in UITests because I receive so many timeouts and as a consequence the tests are not reliable anymore with Xcode 12.5 on BigSur.
I switched back to Catalina, but now I can not archive my project anymore because some external swift packages are build with 12.5. Apple, please fix it soon!
With XCode 11 it's pretty easy to achieve this. Just edit your bot, click on "Repositories" and then the button "Replace Repositories". The latest repository is downloaded again and everything works fine.