I can confirm the run stuttering affecting my characters as well, it was a bit during U13, but far more pronounced during U14. I originally thought it was due to texture loads and phasing lag, which it very well might be... or directx memory leak.
I hope they figure it out, as it would make lotro a much more enjoyable game if it got fixed.
LvL 100s: Beorning, Burglar, Captain, Champ, Guardian, Hunter, Lore-Master, Minstrel, Rune-Keeper
LvL 85: Warden, Minstrel
All my forum posts are my opinions and may not even be that. Also On Twitter: @leixicon