https://bugs.winehq.org/show_bug.cgi?id=44146
--- Comment #4 from Christian christian.frank@gmx.de --- (In reply to Józef Kucia from comment #3)
It's probably the same issue as in bug 42592.
Sadly i can not check that theory cause i don't own The Witcher 3.
I usually use wine-staging and the dx11 perf never was really good but i haven't seen such a slideshow in wine-staging in the games i tried.
For Wine staging the fps have been bad with the following showing up in different games (Crysis2, crysis 3, prey 2017):
CPU load:High to very high (utilizing 3-4 of my 4 cores) GPU load: Low (mostly 30-40%)
So either wine is not feeding the driver fast enough or the driver is not able to feed the gpu fast enough.There is a huge bottleneck somewhere. If a look at the fps of the games they all would be really playable if the gpu would be able to run at 100% load like it is on Windows.
In that specific case with wine-dev and crysis 2, the gpu is loaded ~ 50% but the games is super slow.