On my laptop I switched from Debian to Fedora and that had a distinct impact on gaming performance, though I think it had more to do with how I had it set up previously. For instance I used full disk encryption for Debian, but skipped that on Fedora, because it does seem to impact games noticeably.

But it also might be because Fedora is more bleeding edge, so the OS itself might actually play a role here.

On my desktop I’ve been running Bazzite and that’s been pretty great so far.