...or alternatively, set a minimum FPS (in the same options area). This avoids problems associated with overriding TimeDelta, since it doesn't tie your game speed to your refresh rate. 60 seems to work well!
Of course, you're still going to get slowdown where you would have had glitchiness before - but if you're overloading the computer, it has to slow down or skip stuff, those are really the only options.