I'm playing Metal Gear Rising: Revengeance and it started doing the same thing. I was in mid-combo, the game froze, not the sound though, I think...then, bamm, the camera sensitivity, fps...etc. went through the roof and it continued to run that smoothly, the difference in performance was quite apparent.
I remember playing that latest Need For Speed game, Rivals. There, the internet connection was the culprit. I couldn't even get bronze on the easiest of time trials, because the counter would run normally, but oddly enough, my speed would still be far too slow to make it in time. On a suspicion I turned off my internet and then BAMM, MAX performance, full speed rush. Could immediately gold the time trials, too.
Maybe that's the problem here as well, but I cannot be sure.
