All three Linux distros managed to beat Windows 11 while using Vavle's Proton compatibility layer.
Arch and other Linux operating systems Beat Windows 11 in Gaming Benchmarks::ComputerBase benchmarked three different Linux operating systems and found that all three can achieve better gaming performance than Windows 11.
Makes you wonder how much faster these games could go if Proton wasn't needed.
I'd like to see more configurations tested though. I have a 7950X3D CPU and I'm interested how well Linux handles assigning the "correct" cores (3D cache vs. higher frequency) depending on the game. Would also love to see whether games under Linux further profit from the large cache.
I think the impact of Proton is negligible nowadays. It's basically just an implementation of a library the game uses. If it wasn't Win32 it could be another library like SDL. The normal game logic is usually done in something nearer to the CPU anyways, which will be the same regardless of OS. And if the game uses Vulkan instead of Direct3D the graphics are also running almost directly on the GPU.