New subject: [Bug 52180] Significant performance regression in The Sims 2

6 Dec 2021


      https://bugs.winehq.org/show_bug.cgi?id=52180
Bug ID: 52180
           Summary: Significant performance regression in The Sims 2
           Product: Wine
           Version: 6.23
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: wine-bugs@winehq.org
          Reporter: sashok.olen@gmail.com
                CC: huw@codeweavers.com, jacek@codeweavers.com
   Regression SHA1: c4b258eff75d54fdc0eb9b1843db5f77318f836c
      Distribution: ---
Hi, between Wine 6.22 and Wine 6.23, The Sims 2 suffered a significant
performance decrease.
Through bisect, I've discovered multiple changes that contributed to this.
Here is the progress of performance degradation between 6.22 and 6.23 version,
tested on a machine with AMD Ryzen 3800X by loading into the "Pleasant" family
in the "Pleasantville" neighborhood and focusing on one of the household
members and zooming the camera out all the way out during clear weather. The
graphical backend used during tests was DXVK due to Wined3d not working with
the game (only wine-staging does, and even that has a lot of graphical issues
and is a lot slower). And while Sims 2 doesn't have a built-in benchmark tool,
I've found that the value differences have been quite consistent and reliably
reproduced.
wine-6.22 - 47-44 fps
commit d7133c97d91a0dbc746a4c9711831f45704c8b43 - 9-1 fps
commit 318673405c6296342ef49177de26440f69a4b0be - 44-39 fps
commit c4b258eff75d54fdc0eb9b1843db5f77318f836c - 36-30 fps
wine-6.23 - 36-30 fps
I was not sure which commit to specify as the offender so I specified
c4b258eff75d54fdc0eb9b1843db5f77318f836c as one.
It should be noted that the game suffered a similar performance regression in
the past (see https://bugs.winehq.org/show_bug.cgi?id=51047), which might be
related or give a clue as to what the issue is.
And while it's not really relevant, it should be noted that the game is
generally very CPU-bound and runs quite a lot slower with wine+DXVK than
Windows10+DXVK, roughly 2-3 times slower.
In case it might be useful, here's an apitrace of the game:
https://drive.google.com/file/d/158QpcQ98n2h2xCSkpvPFpiwqYkydIRqk/view?usp=s...
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[Bug 52180] New: Significant performance regression in The Sims 2