[Bug 48901] New: Agents of Mayhem has terrible performance after a few seconds

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48901

Bug ID: 48901
           Summary: Agents of Mayhem has terrible performance after a few
                    seconds
           Product: Wine
           Version: 5.5
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

After loading Agents of Mayhem, the menu will start at ~60fps, but then after a
few seconds, it reverts to ~2fps (with a frametime of ~300-400ms). The issue
happens with both DXVK and WineD3D.

The CPU usage isn't particularly high, and the audio plays fine without any
glitches (pops would usually happen for extremely low framerates when cpu or
gpu limited), which led me to believe it might have something to do with the
sleep time. Changing the graphical preset makes no difference, but uncapping
the frame limit (from 60fps to Uncapped), it immediately doubles the frametime
(~300-400 to ~600-700ms), and reverting it back to capped immediately reverts
the frametime back to ~300-400ms.

Disabling esync/fsync makes no difference.

[Bug 48901] Agents of Mayhem has terrible performance after a few seconds

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48901

--- Comment #1 from qsniyg  ---
I forgot to mention that when playing back an apitrace I recorded, there were
no performance issues (though they were present while recording), so this is
unlikely to be related to GPU usage.