> I've noticed a notable performance penalty (around 10%, even higher on GPU heavy games) when running games with Proton, which is mainly why I haven't dropped Windows yet.

I don't mean to dismiss your comment at all, but I'm surprised that such a low overhead would be the primary reason holding you back from switching. The difference between, say, 100 FPS and 91 FPS seems so negligible in my mind that it would be pretty near the bottom on the list of reasons not to switch to Linux.