Okay, so I'm going to have to appear n00bish here... What do you mean by "horizontal span or dual-view"?

I've got a quad-core system, and with just 2 instances of wow going everything starts to bog down. One instance is running on my main monitor (24" at 1920x1200) on an nVidia 8800GT and the other is running at 1600x1200 on an nVidia 7950 GTX.

My FPS drops to the 20s when I have both instances running. I'm running XP Pro as well. Looking at my task manager, CPUs aren't peaked (although only two are being used sadly.) Memory usage isn't high and these video cards should be more than enough...

I must be missing SOMETHING...

Thanks,
AndyB