I'm surprised this is so bad. I expected the experience to not be polished on Windows Steam Deck, but I didn't expect gaming performance to be this bad. Maybe the drivers are just not mature. I can't for the life of me explain what's happening here. As good as Proton and DXVK is, it's still gonna bring it's own overhead, so even if Linux is lighter than Windows, the two should still even out at least, and not have Windows that much behind.