[Bug 44682] New: Kingdom Come: Deliverance, The Witcher 3: low performances

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=44682

            Bug ID: 44682
           Summary: Kingdom Come: Deliverance, The Witcher 3: low
                    performances
           Product: Wine
           Version: 3.3
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: directx-d3dx11
          Assignee: wine-bugs at winehq.org
          Reporter: ben at tokidev.fr
      Distribution: ---

Using the nvidia latest proprietary drivers and wine-3.3, it seems there are 
low performances on both Kingdom Come: Deliverance and The Witcher 3 (despite,
for the later at least, bug #42592 being marked as fixed in 3.3). This is using
CSMT (by explicitly enabling it in the registry), and with
__GL_THREADED_OPTIMIZATIONS=0 (as suggested by the aforementioned bug report).

Yet when using wine-2.21-staging with CSMT, performances are much better. Using
wine-3.3-staging (the new 3.x rebased staging fork by alesliehughes at github)
with CSMT does not seem to produce good results either (that is, not better
than normal 3.3).

As an example, for Kingdom Come: Deliverance with details set to high on a
1070TI and in the exact same conditions:

* Wine 3.3 produces ~5 to 10 FPS.
* Wine 3.3-staging produces roughly the same.
* Wine 2.21-staging produces ~20 to 30 FPS.

The results are similar in The Witcher 3 (3.3 is pretty laggy in ultra,
although almost playable; 3.3-staging is the same; yet 2.21-staging makes the
game completely playable at the same level of details and performances are
better by at least twice).

There are no explicit messages in the log that may suggest an easily
identifiable cause.

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