We've shared this elsewhere but just to be clear -- the game is currently CPU bound due to a limit on how Unity 4 handles physics. It (Unity 4 physics) is not optimized for multi-core CPUs, which means raw CPU speed will help you more than having a lot of cores. You'll notice that in our large exterior regions, like Pleasant Valley, where there are tens of thousands of objects, that framerates are not as high as you might expect on high-end hardware. This is due to that physics problem. We're m