Along with everything else that could be said about this, I don’t think that is even a major problem. Everything I’ve tried to run on Steam Proton runs at 60 FPS with highest settings. My guess is that Vulkan has enabled much better Direct3D emulation.

(Of course, I don’t play much and I didn’t bother to benchmark. It probably is still worse than native in many cases. But hey, glitch free and fast enough for me. Was very surprised to see games with Denuvo running great.)