I tried the new hard drive, no help!
later I downloaded the ivpbot(podbot), it's getting better, reduced a lots of lagging. But still, at the intense part there will be a little lag. (Actually I'm not very sure if this is lagging, it just feels like you're playing Black Hawk Down on PS2(I'm not very sure if this is correct either he....))
Maybe could you guys teach me how to sets up the performance&quality settings in the video options....
and sorry that I can't type Chinese now lol.

Thanks...