I agree with all the other posts. I have 2017 15inch MacBook Pro 16Gb (cost new about $4500 AUD). Running Catalina all was good - everything worked and was fast (or fast enough). Biggest mistake upgrading to Big Sur (now 11.1). Apps super slow to load (like I have to check if they are loading at all). Spotlight has not worked more times than it has worked. I have followed all the advice to reset and reindex etc etc. I am left with a machine that is barely usable. Seriously I even booted up an old Windows 10 machine to get something done because of the issues I was having with Big Sur (WinZip broken ?). As I have stated in other posts, releasing a product / OS in this condition would never have been allowed in Steve Job's day. Apple now fully embrace the concept of MVP (minimal viable product) - yeah I know its broke but what the heck its good enough !!! Let the customers find the issues !