So I bought Arma 2 + OA and installed DayZ 2 days ago. My PC is a high end top notch pc. I tried Arma 2, it runs all smooth on Very High settings. 40~ fps. (At any place, desert, open areas, tight cities) I tried Arma 2 Operation Arrowhead, it runs 30-35~ fps in plains and huge opens spaces, but in tight places like cities and vilages the fps drops to 15-20-25.) I tried DayZ. Runs just like OA. Low FPS in open areas and UNPLAYABLE in areas like Cherno And Elektro and all the other cities and villages. The FPS stay the same ay any graphic setting. F.eksample: DayZ, Very High, Cherno, 15 FPS DayZ Very Low, Cherno, 15 FPS Arma 2, Very High, Cherno, 40 FPS Arma 2, Very Low, Cherno, 40 FPS The game itself doesn't lag. But there is some problem with the expansion OA and DayZ. This is what I have tried Changing GPU_MaxFramesAhead GPU_DetectedFramesAhead to 1, And some other file edits that I don't remember as I deleted OA (For an reinstall) I have seen this problem appear to many other people on these forums Even CYRI confirms that I can run it You Have: AMD Phenom™ II X6 1100T Processor You Have: 3.3 GHz (No overclock) You Have: 8.2 GB (RAM) You Have: Microsoft Windows 7 Service Pack 1 (build 7601), 64-bit You Have: AMD Radeon HD 6900 Series Pixel Shader version 5.0 Vertex Shader version 5.0 Dedicated Video RAM 4.0 GB You Have: Apowersoft_AudioDevice (Sound) Why does the fps problem only occur to DayZ and Operation Arrowhead and not Arma 2 (Vanilla)? Been using the Six Launcher. I even ran dayZ with the CpuCount=6 in preferences (Which didn't help) I had DayZ (v 1.7.2.6) I can run all the other games on Ultra High settings like BF3 and Guild Wars 2 without problems. So what is the problem here? I feel like I wasted some money here :/ Been trying to fix this for the last 2 days since I got it. Impossible to kill a zombie in a city with any gun... Please help me out Oh and also the CPU usage wasn't high at all. Somewhere between 30-60%. The heck? I have nothing else running that uses more than 30k kb.