Yes and here is the fix!!!! That's right finally got my computer to run with NO STUTTERS!!! It seems for whatever reason all of us who are having stutters have either Intel or AMD multi-cores, with graphic cards that give us great frame rates till the "hiccups" occur. What I did even after freeing up all system resources,
( I have 4 gigs of ram ), put more of the work load on my video card. By bumping up my Maximum pre-rendered frames to 4, I am able to use 75%-85% of my video's ram, versus of a setting of 3 Maximum pre-rendered frames and using only 50% of my video ram. Not sure what is in the coad that affects us multi-core users but the flow of data from the CPU to the GPU seems to be the key. I have now flown with everything on gettin 73-75 fps and NO lock-ups or stutters for over 3 hours now. Keep in mind with however much ram you have on your video card you may need to tweak the numer of frames that suits your ssytem best. But with 512 MB on my video card this setting seems to work the best for me. Wish everyone luck, and hopes this works for you. 
What texture size, resolution and card do you have?
I did a quick test for me in offline mode (9600GT 512MB, 1280*1024, textures 512), and did try all settings from 3-8 (each time restarting game of course.
The differences in used vid mem were absolute minimal, and I couldn't get over 25% used vid mem.
EDIT: made no difference in online play.