[Bug 42592] The Witcher 3 has poor performance

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42592

--- Comment #32 from Kai Krakow <kai at kaishome.de> ---
Meanwhile, I upgraded to Wine Staging 2.18 (as provided by Gentoo) with
integrated patches supplied via portage patching feature for:

  * https://dev.wine-staging.com/patches/205/
  * https://dev.wine-staging.com/patches/204/

Overall, the game runs a little bit better now. Numbers stay roughly the same
but everything looks smoother overall even when I put back 60fps limit and
increase graphic detail.

But one thing I'm seeing now (compared to 2.17 before): The game freezes for
short times especially in the beginning and when entering new areas or the map.
I believe that's mostly due to the shader caching patch tho I didn't see this
effect with 2.17.

I was using both patches already in 2.17. From the news page I don't see any
important update that's related to d3d performance. I wonder what makes the
difference?

There's one thing I changed at around the same time: I turned off madvise'd
huge pages support in the kernel. But that's counter-intuitive.

I currently arrived in Ard Skellig. At the current stage of performance I can
clearly see, while walking through the forests, that one graphical bug seems to
have some bigger impact on performance:

https://bugs.winehq.org/show_bug.cgi?id=43828

These distortions sometimes reach through the whole forest or are visible as
flickering in the background behind the trees while monsters affected by this
bug are around. The game runs much more sluggish during that bug, even if such
monsters are not in the viewport (like behind me). The flickering effect I see
clearly tells me that the visual bug is still rendered even when the affected
object itself should not be visible.

I guess that the following bugs could have a similar performance effect:

  * https://bugs.winehq.org/show_bug.cgi?id=43158 (medium impact)
  * https://bugs.winehq.org/show_bug.cgi?id=43131 (small impact)

Since Novigrad is full of these visual bugs, it would explain why it ran so
slow. Also, Ard Skellig is full of those bugs in and around villages. I'm
seeing performance clearly drop in those areas.

So maybe the above bugs should be cleared first before investigating this
further.

When staying away from such visual bugs, the game seems to run really smooth
now, even during fights with a few characters around.

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