AMD cards are notoriously bad at the DX11 API, hence the better performance in Vulkan, while NVIDIA cards work flawlessly in DX11, so there is little or no benefit to using dxvk. I tried it on a GTX 1660 Ti and it gave no performance increase, in fact it made it worse by using 800-1000 more VRAM for no reason, while the fps remained the same. However, this may depend on the game and the game engine itself, as they were titles where I was able to get some performance boost.Tried it out of curiosity even though I have an nvidia card and performance took about a 25% hit.
Really interested in other people's results given this is some kind of compatibility/translation layer thing.