I have the same issue. Whenever I got into PvP, Skirmishes or Dungeons my framerate goes bonkers. I've narrowed it down to being caused from multiple spells going off, I think. I have a beefy rig so that's not an issue. No matter what setting I put it on it will just go bonkers crazy when there are a lot of spells or…
I'm really looking forward to the Control Wizard. It's one of the classes that really makes me want to get my hands on the game. It actually LOOKS fun to play. Not many games I've seen recently make me actually think, "Wowers, that gameplay actually looks fun! GIMME!"