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.
I really wish valve would make this more clear on steam store pages. It says games are “unsupported” on steam deck due to anticheat when really it should say something like “The developer of this title does not allow players using the steam deck” so that people are more aware it’s not linux or valve’s fault