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.
Vanguard, BattlEye, EasyAntiCheat, Ricochet, etc… all run in the Windows Kernel and most, if not all, have the functionality to run arbitrary code, so might as well class them as rootkits.