For Tank forwardmovement this issue is partially reduced by fake gears but not completely removed. Fake Gears produces servere stuttering at slow speeds (see http://feedback.arma3.com/view.php?id=19182) and nasty audio problems (especially when turning).
The stuttering during turning can also cause the game to feel as if it is dropping frames very badly, but in reality it's the jerky movement of the vehicle, not the frames