Altis: Unplayable after a while
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Description

After playing a couple of time on Altis the game becomes unplayable (0-1 FPS) and the graphics become very ugly. The menu does not react and I have to end the game with the task manager.
I can play some missions for about 30 minutes, other missions only for 5 minutes before the bug occurs. Apart from that the performance is good.
It seems, that some situations mostly produce the error. For example: In the gunships showcase the error occurs nearly every time when I try to land my helicopter at the rearm task.

Stratis works fine.

Specs:
Gigabyte P35-DS3
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs)
4 GB Ram
NVIDIA GeForce GTX 460

A friend of mine has almost the same PC (we bought the parts together, but in the course of time we upgraded to different GPUs), uses the same OS (Win 7 32bit), the same arma graphics configuration and the same pagefile size (5,5GB). He has no problems.

I also tried the maxmem parameter at different values but with no result.
{F22139}

Details

Legacy ID: 734928373
Severity: None
Resolution: Fixed
Reproducibility: Always
Category: Altis Performance

Additional Information

Arma3.cfg:
language="English";
forcedAdapterId=-1;
detectedAdapterId=0;
detectedAdapterVendorId=4318;
detectedAdapterDeviceId=3618;
detectedAdapterSubSysId=0;
detectedAdapterRevision=161;
detectedAdapterBenchmark=169;
displayMode=0;
winX=16;
winY=32;
winWidth=1024;
winHeight=768;
winDefWidth=1024;
winDefHeight=768;
fullScreenWidth=1920;
fullScreenHeight=1080;
refresh=60;
renderWidth=1920;
renderHeight=1080;
multiSampleCount=2;
multiSampleQuality=0;
particlesQuality=0;
GPU_MaxFramesAhead=1000;
GPU_DetectedFramesAhead=3;
HDRPrecision=16;
vsync=1;
AToC=0;
cloudsQuality=2;
pipQuality=2;
dynamicLightsQuality=1;
PPAA=0;
ppSSAO=1;
ppCaustics=1;
serverLongitude=2147483647;
serverLatitude=2147483647;
steamLanguage="English";
tripleBuffering=0;
ppBloom=1;
ppRotBlur=0;
ppRadialBlur=1;
ppDOF=1;