I'm currently working on a top down shooter game, and the speed I move the objects at is scaled by gameTime.ElapsedGameTime.Milliseconds to make sure they move at a constant speed independent of the framerate.  However, sometimes there are stutters and they don't always seem to move at a constant speed.  I thought this could be cause by sudden drops in the framerate so I tried smoothing the value with previous frametimes, but this still does not give the desired result.  I also remember reading somewhere that GameTime is not very accurate on the Xbox360 so I tried to use DateTime.UtcNow.Ticks instead, but this does not seem to make any difference at all.  Any thoughs on this issue would be greatly appreciated.

Regards,
Dennis

This thread may help.  It's also possible that stuttering is a result of garbage collection, so make sure you're not repeatedly creating and deleting a lot of reference types.

Thanks! I'll give TotalMilliseconds a shot.