The performance increase on DX11 is incredible, I never thought I'd be playing Act III at 60 FPS on my 1050ti! The game is completely unplayable on Vulkan though, it's at under 10 FPS most of the times.
Seeing the same on Linux with Proton. However, when running dx11 my game grinds almost to a halt during longer NPC conversations (one time yesterday it froze my entire system), but once the conversation is over, everything returns to normal again. This is not something you have experienced?
The game is completely unplayable on Vulkan though, it's at under 10 FPS most of the times.