Extreme FPS Boost when Window looses focus.

[v4mp123]

Hi guys!

 

Here my Problem:

Witcher 2 runns allways at 20 -24 fps.

There is no significant change if i decrease the Resolution or enable/disable various graphicsettings (except ubersampling of course :-)).

 

But one thing is a bit fishy:

I changed to window-mode and startet Fraps.

I played a few minutes and i recongized that nothing has changed.

BUT:

As i switched to a other window (alt+tab) ---> suddenly the FPS went up to 50 FPS!!!

After i klicked on Witcher-Window again the frames dropped to 24.

It is definitely no measuring error because the game runs very smooth when tabbed.

PS: Same behaviour in game menu:

--> focus on witcher2 window: 22 frames

--> focus on other window: 650 frames

 

 

My hardwarespecs:

i7 860

hd 4870 1gb @ 800 MHZ (Memory 995Mhz)

4gb ram @ 1600mhz

Tested with AMD Catalyst 11.5,11.5b and 11.6

OS: Windows7 64 bit

 

Any idea how i solve this issue? 50 FPS would be nice ;-)

Is it a gamebug or a driver bug?

Does any one else have this behaviour?

Edited June 16, 2011 by v4mp123

[cinco]

nvidia issue. it's been reported before.

[v4mp123]

nvidia issue. it's been reported before.

 

its an AMD/ATI HD 4870; no NVIDIA :)

[tommy5761]

Have you tried disabling antialiasing and vsync you shouldn`t need either of these unless you experience screen tearing . Also disabling vignette and motion blur and also stting your texture memory lower may help

[v4mp123]

Have you tried disabling antialiasing and vsync you shouldn`t need either of these unless you experience screen tearing . Also disabling vignette and motion blur and also stting your texture memory lower may help

 

As I wrote in 1 Post:

There is no significant FPS change if i disable/enable anything except ubersampling

 

I tried resolution 640x480 + disabling all settings and I had also about 24 fps.

 

It looks like the gpu doesnt work at 100%. But i have to confirm this.