If anyone needs an example.
http://frames-per-second.appspot.com/
Just set everything to 60 FPS and 25 FPS, Motion Blue to None and change the velocity to different speeds
At the lower speeds there looks to be no difference... Get to 500 Px per second and there is.
For a game like King Arthur 2, it probably wouldn't matter... graphically.
Of course there is the problem with control inputs.








