Quick question that I can't seem to hammer down to an addon or blizz ui or even just 4.1 but during Heroic Nefarian when the first dominion goes out I DC ever single time, no matter what addons I have up or anything. Then for the remainder of the fight whenever dominion goes out I will sometimes lag or sometimes not, it is very hit and miss.
I have a couple ideas that I am looking at but I wanted to know if this was an issue on your end as well.