[Bug 42592] The Witcher 3 has poor performance

[wine-bugs at winehq.org]

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

--- Comment #40 from Kai Krakow <kai at kaishome.de> ---
Upon the pointer to downgrade the nvidia driver, I downgraded back from latest
beta to latest stable (still above 375, tho). It may have changed a few bits of
how the game feels, nothing dramatic.

But after playing around a little bit, I'm pretty sure that there is no
overloading at any point. The game engine just becomes slow: Physics play slow
motion, movement is slow motion. If the FPS go down, in-game speed also goes
down, like there are some timer ticks missed which the game doesn't pick up
within Wine. It almost always looks like the game does not or cannot skip
frames to keep up with realtime but just slows down the whole game engine,
trying to render every frame...

Something similar is also visible with some "native" ports like Mad Max, and I
guess it uses some stuff that Wine also does (wrappers around syscalls etc).
The guys from Feral pointed out that this may be a kernel issue, timing handled
differently between kernel versions. They suggested to set the CPU governor
from default ondemand to performance. Well, that didn't help at all. But at
least they could reproduce it later and wanted to get a fix in when a newer
kernel version goes stable on Ubuntu (which is their supported platform).

So, with this background: Are there known kernel options which could influence
or explain such behavior within Wine? Since I'm on Gentoo and as such using a
custom kernel build, I'd happily try a few options.

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