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.
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.