Are you playing in Full Screen or Windowed Mode (Windowed Full Screen)?

I had a similar issue running in Windowed Full Screen mode. Someone suggested switching to Full Screen, and I haven't had a stutter since. No if it's an actual "freeze" where a frame is stuck instead of just skipping a frame and moving forward, then I'm not entirely sure.

This also seems to improve my "smooth" frames in the game, when running at lower frames per second.