Have you save the game, then exited out and reload it to see what happens?
Some Console commands are saved, certainly the ones that effect your character. So is the SetScale command I used on my floating butler who keeps getting in the way. Good chance these speed settings you made on the follower will be too.
What remains to be seen is if the follower is told to go away for a while, will that setting be there the next time you find him? Or, will you have to look for the blood stain on a wall because he ran into when his shoes slipped trying to make a turn.