It seems that there is a gap in running speed between speekhackers and honest players (mount riders out run by speedhack on foot). Why don't set a thredhold within that gap over which the player will get fatigue (like theoverweight fatigue) after running for, say 5 sec? The thredhold and the running time before fatigue can be ajusted so that vast majority of honest players won't be affected at all. Even a small portion of honest players who have uber computer and internet connection is affected, consider it more realistic in real life - no athelete can maintain full speed for a long haul. Just trying to help out the designers thinking out of the box.