https://bugs.winehq.org/show_bug.cgi?id=42592
--- Comment #46 from Kai Krakow kai@kaishome.de --- I'm now on wine-staging 2.20 and performance seems to have improved.
I no longer see the tessellation bug on monsters, and in areas with such monster and previously bad performance, things have improved a lot. So the most annoying visual bug is gone and performance has even improved here.
I still see visual glitches like missing textures around cave entrances and the opaque texture bug. I also see performance degradation around such areas. But at least the performance degradation seems no longer be permanent, or better saying it has much less impact. The game still slows down over a longer period of time, but it is much better now.
Overall performance of the game has improved, even at higher detail settings. Physic simulation still has a big impact on time progression in the game: FPS go down, and time seems to run much slower.
Also, rain seems to have a much lower performance impact now.
During first entering new areas, I see a lot of short freezes, probably due to some shader compiling. I guess this new behavior also has to do with the better performance. FWIW, I no longer use the shader parameter caching patch (it was incompatible with 2.20).
For the numbers:
I still have no FPS numbers as debug flags "+fps" simply don't show fps in the log while the game is running (but it's showing up while Steam is starting up).
Interestingly, while the game feels overall smoother now, GPU usage is even lower (around 50% instead of around 65%). Also, the game no longer seems to overshoot time progression during phases where I saw high fps (what felt like 60fps): Fights are no longer feeling like time lapse in high fps situations.
I'm pretty confident that fixing the remaining visual glitches may also improve performance. I don't see how that relates to each other but previous updates show improvement on that matter. Afterwards, if figuring out why GPU usage is so low (CPU usage is also not maxed out, not a single core) there should be a good chance to get high fps out of this game.
BTW: Some monsters are still invisible, most of them become visible as soon as they die.