I have been having this problem where immediately after Buddy Wing starts working, the game stutters like every second. I tried setting affinity and priority but didn't seem to make any difference. My CPU is always at 50% or less when both Buddy Wing and the game are running. I have i5-3450 3.10GHz, 8GB of RAM and a GTX 680. Game runs perfectly fine with all settings maxed out plus lots of programs and webpages open. I don't know what else to try. It is not even watchable at this state.