Movespeed patch should be applied after all other mods patch movespeed.

[rheirman]

Theoretically it's possible that a rider's movespeed is patched after the rider's speed is set to the mount's speed. This can cause an inconsistency between the mount's speed and the rider's speed. Also, it can make mounts faster or slower than they should be due to speed modifiers that shouldn't affect mounts (for instance shoes, or chains etc.)