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 ...
The impressive FPS deltas aside, it should be mentioned that, with the exception of Arch Linux, average frame times (measured as 1% lows, in this case) on Linux were generally behind what Windows managed by up to 20%
I feel like worse 1% lows makes this title misleading. Hopefully with time this gap will close.
1 % lows are likely a driver thing (Nvidia calls it "Game Ready Drivers"), with Arch you'll get new drivers (or kernel versions) much earlier, similar to Windows.