Just upgraded to Big Sur I'm on a 8GB ram (everything else is fast and ok) Im on my 5th hour waiting for Xcode ..bar moves painfully slow and now there's a tiny bit left, while all time was passing by I just installed VS code , android studio with emulators etc , node , git (couldn't wait for Xcode's one), and a whole lot of other things I needed ( I finished all that 2 hours ago) ...and still I'm waiting ...this is the craziest slowest thing to download and install.