It only happens when driving fast. The game skips every few seconds, then goes back normal. Making driving extremely difficult because of skipping screen.
I know the problem you are talking about. It's the tweak the game developers applied on the Patched version of the game to make performance higher on top-end PC's.
If your game is unpatched, I mean version 1.0, then it is the choppy FPS - Which is the game's biggest drawback.