Also Screen tear, even with Vsync is absolutely horrible in this game for me.
Interesting comments, thanks.
I just realised using RivaTuner that my GFX card speed is dropping down to a idle state (like 3d performance speed is dropping out for a moment) this seems to be causing the stutter. I've never really had any issue with this card in any games except this one. I have had the occasional hick-up that was resolved with v-sync or a driver update.