It wasn't the delay I was surprised at - it was the fact she now runs the entire length of the instance.
Previously, when I pulled mograine back to the starting corridor she would just stay in her room.
He wouldn't get ressed and so you lost out on his drop (not a big deal).

The doors have never closed on me when I've been multiboxing this. I just open the doors, stealth in to max range. Fairie fire, turn and leg it.
I've never had the doors close on me doing that.