Earlier quoted context omitted.
They're garbage. They're bad enough that If you have an Nvidia GPU, it's borderline impractical to game on Linux. You can, but you'll be cutting framerates in half or more in many cases.
This is not true at all. I game on Linux (Arch, btw) on my 3090 and every game not using some kind of kernel-level anticheat just works. I have never made formal comparisons, but my experience is that I can't notice a difference in performance relative to Windows most of the time. One exception was Helldivers 2, but the performance gap has more or less closed recently with recent Proton versions.
But you also have a pretty powerful card, unless you're gaming in 4K you could probably take a performance hit and not even notice.
I have a 3060 (prev: 1660 ti) and I can say that I've definitely noticed a difference in performance in lots of games.