DXVK, the Vulkan-based implementation of D3D9, D3D10 and D3D11 for Wine / Proton has version 1.9.3 out now . This is what's used in Steam Play Proton , to help get Windows games running nicely on Linux. It's a bit of an uphill battle to get so many tens of thousands of games to work nicely, but DXVK shows just how powerful and flexible Vulkan is as an API.
This release brings support for NVIDIA DLSS (Deep Learning Super Sampling) for supported games, when used along with dxvk-nvapi . There's also a bunch of optimizations and accuracy improvements for D3D9 that should help fix games like Red Orchestra 2, Dark Souls 2 (original version), Dog Fight 1942, Bayonetta, Rayman Origins, Guilty Gear Xrd and Richard Burns Rally.
Pictured - Deep Rock Galactic on Linux with DXVK (Proton)
Other improvements include a fix for a "DXGI issue which would sometimes cause games to fail to enter fullscreen mode on some displays that do not support low rates across all resolutions" and improvements for Black Mesa, Crysis 3 Remastered, Euro Truck Simulator, Injustice Gods Among Us, Rocksmith 2014, Spliter Cell: Chaos Theory, Sim City 2013 and The Guild 3.
As a reminder: you can upgrade the version of DXVK used in Proton, without waiting on a new release. To do so you can just overwrite the existing DXVK files with the release download of DXVK 1.9.3. You can find your Proton install somewhere like this (depending on your Steam Library drives):
Where x.x is whatever Proton version installed you wish to give a new DXVK.
Inside there you will see "lib" and "lib64", for 32bit and 64bit. Inside each of those, there's a "wine" folder and inside there is a "dxvk" folder and that's where you replace the files with new versions. Do so at your own risk but it's usually harmless. If you mess anything up, one way to ensure it gets reinstalled cleanly is just to remove the "/dist" folder.