Games consistently get fewer FPS on my setup. 3750H GTX1650. Part of it is nvidia drivers being poopoo, most of it being CPU cycles overhead.
Proton's not perfect, but it's been mostly worth it for me not to have to boot windows.
I personally compile it myself off the AUR with the -O3 -march=native flags (look at the PKGBUILD for more details), and I get fewer FPS than Windows, yet more consistently than Wine. No microstuttering.