> But this isn't an option, and Full Screen Safari has weird rendering bug and performance issues.

FWIW I'm a big user of full screen (in most apps that support it) and haven't noticed those issues on either Intel or M1 MBAs.

I wish more apps in full screen mode would hide the UI like Safari does. Most of the time the top bars of icons are simply dead space because most of the time you aren't clicking up there -- and when you do you're only clicking one icon.