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@winehq.org Reporter: dark.shadow4@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?