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 Linux.
In windows defence they don’t really have the resources to compete
As pointed out, in Windows defence, it’s actually faster where it matters. And none of it is going to matter in adoption until every thing is supported 1-1.
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Causes don’t matter. Only the reality. Incompatiblies and crappy lows will keep adoption low.
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Hell, nVidia was actively working against having a working opensource driver reverse engineered by Nouveau. Linux is a thorn in their side and the only reason they somewhat support it today is that GPU compute works so much better on Linux.