Has the author or anyone else revisited this mod to address the stuttering. As Syrcanus noted, it seems to only happen outdoors. I think it may also be the source of another problem I have - when I talk with the NPC, she's supposed to lead me back to the settlement. Instead, after a while I see an error message referring to the grid. I've tried ra and placeatpc console commands. The ra did not help, and the placeatpc seemed to reset the NPC as if had never met her.
The mod has been interesting, but the movement stutter has become a game breaker for me (makes me nauseous after awhile). If there's a fix for this problem, I'd appreciate learning about it, otherwise I'll go back to a saved game before I started the original quest in the mod.