I have been 5 boxing on one PC with no graphical lag at all.

Machine specs: Dual core 2.4 GHz CPUS, 4GB memory, Geforce 8800 GTS with 640 MB video mem, 10000 rpm raptor harddrive.

Latest Nvidia driver ( 6.14.11.7813), Directx 9c, Windows XP professional, service pack 3

Because I use Windows XP I am really only getting 2.75 GB of my 4 GB, but the system is performing much better. Damn microsoft.

I took my 5 toons through Stormwind yesterday to get to stockades(they are 25 now) and had no issues whatsoever. Have not tried outland yet.

I use one screen with 1 big window and 4 small windows. I have 2 window installations, one for the main, and one shared by the clones. The video options on the clones are all at minimum settings and sound disabled. have maxfps at 50 and maxbgfps set to 15.

If I run through a lot of zones via flight or running I sometimes get triangles on my graphics screens and after a while the graphics freeze, but thats the same whether I am running 1 or 5. I have basically given up on solving that problem.