btw. Check that you do not have vsync ON in both game and drivers. It should be switched on only in one place. This mistake of mine killed performance for me as soon as they introduced fullscreen.
Triple buffering should be forced ON with a 3rd party utility if you use vsync or your fps would jump from 15 to 30 fps and back very often.
Also if you do not defragment after each patch the performance can reduce with every patch as files get more and more fragmented.
Try installing .net Framework 4 update 1 from March or April iirc. This game depends on .net performance. If something is wrong with it you can not help it.
The rest is in my sig (link #5).
I learned all these tricks 2-3 years ago trying to run ArmA on a 2 year old rig. And all of them mattered. It was a great adventure and a lot of fun.
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