My Skyrim keeps stuttering and it's really starting to piss me off.
I dunno what it is, either. I tried playing without mods - still happened.
Tried playing with graphics scaled down - still happened.
I dunno what the problem is, but the stuttering makes the game unplayable.
Have you tried using mods that are disabling the shadows? As far as I remember, it helped my game with those damn stutters. And surprisingly, it didn't look bad at all.