Yep I have skipped in the sense
the frame rate doesn't drop below 30 but the frame totally vanish it is like you have a slider of frame from 0-100 while you are playing the game the frames are moving 0,1,2,3,4 etc there comes a point when it something like 22,23,24,25,29,30,31,32 etc will occur.
It is not lag...this is something else...
i think you need a better hdtv or use game mode , framerate on ps3 is 30-29-30-29
now dragon age orgins is 20-1 so don't worry about the framerate its great on pes , there are games like dragon age which are bad ports and lag bad in single player