Group of us managed to complete Spindleclutch on normal this afternoon, but ping kept swinging between 360 and 3100. This evening I've had to alt-F4 twice when the game got stuck while trying to change zones. Any time there are multiple effects on screen the game turns into a flip book. I've been playing on and off since beta, and I don't ever remember it being like this.
I shudder to think what Midyear Mayhem is going to be like.