I've encountered an issue like this as well. Basically, if I make rapid consecutive turns (ie left -> right, right -> left, left -> right again), I start to experience a lot of screen tearing, jerky movement, and input delay despite the fact that my FPS isn't dropping below my cap of 100.
Turning down my settings didn't alleviate the issue, and I don't think it's that my hardware is insufficient either, considering that my CPU is a 3570K and my GPU is a 6870.