I used it to bypass some issues with D3D9 games that AMD's newer drivers had (apparently it isn't OpenGL that takes the short stick anymore, it is just that OpenGL's stick happens to be the shortest :-P). I didn't notice any performance difference.
Regardless, i've switched back to Linux ever since i could run most of my games without needing Steam and Proton (wine-staging with DXVK and VKD3D-Proton - which works on regular Wine too - seems to work perfectly fine).
Gaming on Linux has been a complete joy. Some games do run worse (e.g. No Man's Sky takes a long time to procgen textures), but others run significantly better (10-15% uplift in AOE IV). If a game doesn't work on Linux then I simply don't play it.
My only gripe is VRR under Gnome. I might try Sway out again.
Regardless, i've switched back to Linux ever since i could run most of my games without needing Steam and Proton (wine-staging with DXVK and VKD3D-Proton - which works on regular Wine too - seems to work perfectly fine).