Does ENB normally cause stuttering? I'm using this version http://skyrim.nexusmods.com/mods/15105 and it frequently "stops" the game for a second or few. It gets progressively worse the longer I play. Also I can handle the longer load times, however, it took over a minute to load when I fast traveled from Morthol to Whiterun - a city with these problems in general. Any help?
If you disable ENB in-game, does the issue go away? I can't imagine even the most ambitious END settings to have such a performance hit though, unless you have a really weak rig.