I understand ArmA 2 is an extremely CPU-intensive game, but what FPS am I supposed to be getting in OA playing the original ArmA 2 campaign content with 2013 computer parts? Most of my graphics are set to normal (textures and AF are set to very high, video memory is set to "default," AA is disabled but PPAA is set to low MSAA) and I get around 25-45FPS. In Utes I can easily get 60. I haven't tried any of the OA areas. I remember getting a noticeably higher framerate in Chernarus in original ArmA 2.
CPU: i5-4670k @3.4GHz
GPU: GTX 760 2GB
RAM: 8GB