First time I got ported to dalaran (with the quest at 74) 3 of my clients crashed. I then made the mistake of setting my hearth there, so every time I wanted to go to Northrend (or just leave an instance) it would take 10 minutes to load all 5 clients, with 2 or 3 of them inevitably crashing. I just moved my hearth back to somewhere else, and really try to avoid the place if I can, or load 2 at a time. It really sucks, I hope they do something about the resources used there. I never had that problem with Shat.