Could be CPU-heavy and that's just what you get. Like Sunius said, it really isn't an issue since it's well above the monitor's refresh rate. If worried that it's not behaving as it should, check Tom's benches for a GPU-heavy game and compare with your friend's i7 system.
nah, I did closed everthing before I played this game, and I made the peformance max in video card setting.
I heard some game with fps around 0-30, but this game is always around 0-250