GOG releases are easiest to use with Wine, since they provide standalone DRM-free installers (which you can easily use in separate Wine prefixes). You can download them on Linux using lgogdownloader.

If you download using the browser (not recommended), make sure to select "classic installers".

I'm likely hitting the limitations of MESA/radv (18.1.X - Solus) but performance is quite good on my Vega FE with averages in the upper 50s. I still get hit with major stutter every so often which drops the frame rate down to the teens. I'm going to finish the other game in my backlog (darksiders 2) first while I wait for new wine/mesa/dxvk to hopefully improve the situation.

3440x1440
Maxed Settings - (Nvidia specific gimmicks turned off of course)

If you are hoping for the stutter to be fixed: It's straight-up impossible to fix or even improve.

Quoting: YoRHa-2BIf you are hoping for the stutter to be fixed: It's straight-up impossible to fix or even improve.

Can shader compiler itself get faster?

Quoting: GuestMore like could precompiled shaders be think?

I think the problem with DXVK was that shaders were genereated dynamically, and somehow there was no way to use cache approach there (i.e. you can't know in advance what the generated shader will end up like, so you need to generate it each time)? May be @YoRHa-2B can correct me. Actual SPIR-V compilation to machine code is probably already cached by radv and other drivers.

Though I'm not quite clear why this process is non deterministic. Aren't input shaders (DXBC) a fixed thing? So the output should supposedly be a fixed thing too. If the input / output relation can be cached, the transpiling step can be skipped.

Maybe this could be of interest to some of you, but I created a Witcher3.desktop in usr/share/applications which starts a script to launch DXVK's "The Witcher 3" and added the desktop shortcut into my standard linux Steam client library. I have no benchmarks to back it, but I could swear it's the smoothest performance I get from TW3 (aside from windows native, obviously). On top of that, my Steam controller gets fully supported, without falling off the window range (my experience with sc-controller from Kozec with high precision camera).

Are there tools related to graphics performances in the Steam Linux client? I didn't expect that.

I usually create .sh launcher for each game in Wine, so I can easily plug into logging and modify launching logic.

That's quite what I did. It's just that I launch it via a .desktop file so that it may be added to my steam library as a "non-steam games" for Steam Controller support. Is it possible to add a .sh file to the Steam Library? I must admit that I didn't verify that.

I haven't used Steam, but I suppose you can add any executable there (adding a .desktop launcher for that .sh script should be easy).

No problem with my .desktop file, it's already working. Thanks.

All I wanted to say is, for those that want controller support, adding the DXVK-Witcher3 to the Linux Steam client seems to be a working solution. There are probably other ways, but that's the best one I found, after trying different combinations.

By the way, the Steam version of Witcher 3 doesn't require Steam to run. It's just that you loose the cloud saves feature.