It really really looks similar to some problems i had earlier, all of them was caused by A. Either a faulty addon making massive amounts of errors in a short timeframe. or B. Recount/Skada breaking because of an overload of data.
I would, if i was you try next time, playing with your bare minimum of addons. And i mean the lowest amount of addons you need. If you don't get that stuttering in the game try turning on addons throughout the encounters and see if one "breaks" your game.
---------- Post added 2013-03-20 at 03:37 PM ----------
One thing though, is every hunter who experience this using Skada?