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You should really report this issue to the author, or let us know which addon you're talking about if you want to get help on this matter.
Ultraxion is an FPS drain regardless of addons, for three mains reasons:
1) The fight is atop Wyrmrest Temple, and gives you a huge overlook over Dragonblight
2) The 'Twilight Realm' graphical effect which turns the sky purple is very GPU intensive, similar to the sky in Lost City of the Tol'vir
3) Everyone is stacked up, meaning you have the spell effects of an entire raid visible on your screen as well as various AOE heals.
I can tell from my UI though, which colours the border of a certain panel according to combat state, that there are no problems with events firing.
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