[Bug 58522] New: BizHawk Low Display Update Frame Rate

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58522

Bug ID: 58522
           Summary: BizHawk Low Display Update Frame Rate
           Product: Wine
           Version: 10.12
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

I am running BizHawk 2.10 (https://tasvideos.org/Bizhawk) using Wine on Arch
Linux, since the Windows version has more features than the Linux build.

When upgrading Wine from 10.11 to 10.12, my frame rate drops from 60 to 40.
Everything is running slowly and the sound is stuttering. The low frame rate
occurs even when no game is running and the emulator is just rendering a black
screen. I have switched between the wine-10.11-1-x86_64 and wine-10.12-1-x86_64
pacman packages repeatedly and was able to reliably reproduce the different
frame rates.

BizHawk has multiple display methods (D3D11, OpenGL, GDI+). Both D3D and OpenGL
have the low frame rate issue on Wine 10.12. GDI+ can render the black screen
at 60 fps, but immediately drops to 30 when running an actual game. I believe
that this is an issue with the GDI+ display method and not with Wine 10.12,
since the same thing happens on 10.11.

It seems to be a genuine slowdown issue, since limiting the frame rate to
anything below 40 produces the expected results, it just doesn't seem to be
able to ever get above 40, even when removing all frame rate limits.

Outputs (stdout) of BizHawk seems to not be meaningfully different between Wine
10.11 and 10.12. CPU utilization by BizHawk also seems to be more or less the
same (~40%) between Wine 10.11 and 10.12.

[Bug 58522] BizHawk Low Display Update Frame Rate

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58522

Ken Sharp  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |https://github.com/TASEmula
                   |                            |tors/BizHawk
           Keywords|                            |download, performance,
                   |                            |source

--- Comment #1 from Ken Sharp  ---
A regression test will help pinpoint the change in Wine.
https://gitlab.winehq.org/wine/wine/-/wikis/Regression-Testing