Ok, so im now at my wits end with this problem, since renweing my subscription to Isboxer its completely unuseable and i am all out of options. The problem is now happening with all my teams I have deleted them all and remade them to try and see if that makes a difference and it doesnt. I've tried playing the game with no addons at all and still the same problem.

I did notice tonight when trying to go and kill Kazzak that its only the master account window that is causing the problem. Its using double the memory of the other wow accounts. when all the accounts had frozen to 0 FPS i closed the master window and the remaining 4 instantly went back up to 60FPS.

http://imgur.com/IHOHVly

Saw this pop up for the first time tongiht, surely 16gig of RAM is more than enough to be running 5 instances of wow and with some room left over too.

If anybody could please offer some thoughts to resolve this it would be greatly appreciated. I'm missing multiboxing and really want to continue playing.

Thanks in advance Jim.