[Bug 42237] New: UnrealEngine has low fps when window is focused

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42237

            Bug ID: 42237
           Summary: UnrealEngine has low fps when window is focused
           Product: Wine
           Version: 2.0-rc5
          Hardware: x86
               URL: http://download.informer.com/win-1192762707-d95684bc-5
                    71071e5/udkinstall-dln.exe
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: dark.shadow4 at web.de
      Distribution: ---

Created attachment 56896
  --> https://bugs.winehq.org/attachment.cgi?id=56896
Screenshot showing the fps drop

I assume this issue is specific to UnrealEngine, I tested it with two different
games "Hunted - Demon Forge" from Steam, and the free horror game "Don't Look
now."

I linked to the installer of the second game, taken from a mirror since the
original is down.

Both games have exactly the same issue, low framerate that makes it unplayable.
But interestingly only as long as the window is focused, if you just watch it
while another window is focused, the fps shoot up. Note that the game isn't
paused, it's still rendering everything, just up to 10 times quicker.

If you look at the attached screenshot, you see very clearly where I unfocused
the window, and where I focused it again.
Also, while the window is focused it doesn't use up more CPU, there's plenty
resources left.

Tested with mesa 13.0.3 on a Radeon R9 285. FPS taken from the
"GALLIUM_HUD=fps" environment setting, but the stuttering is pretty obvious,
too.

Ideas what could cause this issue?

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