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Windows 11 scores dead last in gaming performance tests against 3 Linux gaming distros
(www.notebookcheck.net)
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Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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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!
I played around with scaling a bit, but removed the commands in my sway config afterwards. I do have different screen resolutions tho.