Recent testing revealed that Arch Linux, Pop!_OS, and even Nobara Linux, which is maintained by a single developer, all outstripped Windows for the performance crown on Windows-native games. The testing was run at the high-end of quality settings, and Valve's Proton was used to run Windows games on ...
A typical Linux distro, especially lightweight and simpler ones like Arch, will of course be better than a bloated OS, like Pop or Windows. The only problem with Linux distros might be the choice of tools - X and AMD will work much better overall than Wayland and Nvidia.
Just that many people may have an Nvidia GPU before deciding to use Linux, and some people just prefer to use Wayland over X for literally everything else.
My PC with Wayland + Nvidia has so many problems with gaming, especially flickering and performance, while my Laptop with Wayland + integrated Intel graphics has no problems at all - even in games, that I wonder if Nvidia + Wayland still really sucks ass or if my GPU is just broken. Currently there's a bug where frames are 'switched' somehow, so it's not Frame 1, Frame 2, ... Frame n, but Frame 1, Frame 3, Frame 2, Frame 5, Frame 6, Frame 4 etc.
I expect it to be fixed by an update of nvidia in the future, but there are always such bugs.
That frame issue is because of the fact that Nvidia uses "explicit sync" and AMD/Intel use "implicit sync" - XWayland is built to only support implicit syncing for now (Nvidia is trying to get it changed), and since most games right now run under XWayland... Along with a ton of apps of course.
Until then, that issue won't be resolved sadly. It's what finally pushed me to get an AMD card since the issue has been open for over a year with a ton of back and forth.
If my experience is any indicator, your GPU is fine :(. Any chance you're using mixed display scalings? I've got an RTX 3050 eGPU for my Plasma/Wayland laptop, and for the most part it actually works fairly smoothly (albeit more slowly compared to windows), but if I try to run a game at a higher resolution than my monitor (used by Plasma for mixed scaling) I get constant flashing/frame shifting, but when I drop it down to the native 1080p it starts working again
As a side note, X and eGPUs do not play well together, but Wayland is literally plug and play after installing the drivers--I can even hot plug/unplug as long as nothing's using the GPU!