I hope some of the future patches fix these performance issues, because right now I can't figure out why it's running so badly.
I'm running Windows 7 x64
AMD Phenom 9500 (2.2ghz Quad Core)
4GB DDR2 Ram
ATI 5850 1GB DDR5
And OA runs horribly.
At first i was running Visibility - 3050
Video Memory - High
Anisotropic Filtering - Normal
AA - Low
Post processing effects, Terrain and Object Detail - Normal
Shadows - High
With a 3D resolution at 1920 x 1080.
I ran all 3 benchmarks (launching with the combined operations) and got the following average frame rates.
Benchmark 1 - 17 FPS
Benchmark 2 - 5 FPS
Benchmark 3 (the Arrowhead one) - 18 FPS
I then changed the Shadow detail to Normal, Post Processing effects to Low and the resolution down to 1120 x 896 as well as making sure VSYNC is disabled and using the -nosplash -cpucount=4 -exThreads=7 launch commands.
My Benchmarks were then as follows.
Benchmark 1 - 18 FPS
Benchmark 2 - 5 FPS
Benchmark 3 (the Arrowhead one) - 20 FPS
So as you can see i got almost no FPS improvement.
It's making the game really difficult to play which is a shame because myself and some clan mates really got into Arma 2 and we are planning on doing the same with Arrowhead.
If anyone has any ideas on anything else I can try I'm open to suggestions.