It uses the following ports:
70.42.29.75 port 21908
70.42.29.75 port 21325
23.198.49.103 port 80
70.42.29.74 port 45461
Shaping the connection with something like Netmonitor causes the game to be unplayable. All you can do is wait it out and a few minutes later you can once more play. But even if you restart your client it has no effect. You can do nothing but wait till it's done. It's almost like their pulling some kind of data from your client. No other processes were using data and I tried this on multiple PC's from different sites with various connections to test. isn't Specific to my computer.
EDIT: Screenshot. Also seems only to happen while dropping 4 mans. My maximum download speed is 30kbps.
Edited by Grifthin, 12 September 2013 - 10:19 AM.