Probably Brave browser for lowest hassle, it is a open source and built off of chromium. Problem is that it doesn’t have any extensions so take that in account.
Maybe Firefox, but I heard Mozilla doing shady stuff
Don’t really have any empirical data on performance, but from just using the browser I don’t have any noticeable slowdowns
I’d just pick a open source browser off of this list
Try them out and find one you like