The solution wasn't to speed up unit movement and kill rates, it was just to make the routing stage quicker. That could have been easily accomplished just by, for example, giving the player the option to quit the battle with a victory as soon as he had all enemy units routing, and just autocalc the remaining casualties.
and killing routers was MUCH to effective anyway. If you had enough cavalry you could always destroy 90% or more of the enemy army. How realistic is that.
Atleast in MTW the routing units still fought back a little, and didn't die instantly by just being touched by an enemy soldier. And they were actualy capable of breaking through a surroundment. In RTW a routing unit has no brain and no defence, making most routing units get annihilated almost instantly. On top of that the direction they chose to run in makes MUCH less sense then how they did in MTW.