Now forgive me if I'm mistaken, but I remember on Live when you hit level 60, your Sneak/Hide no longer slowed down your movement speed. It "seems" fine, but I'm still slowed a little bit. This is most noticeable when auto-following someone. I was following and someone with the same movement speed buffs as me without sneak/hide and I was keeping up just fine. When I turned on sneak/hide and tried to auto-follow, it wasn't before long that I stopped auto-following them because they got too far ahead of me.
Thanks,
Levith