This is probably a setup issue on my part, but I wanted to see if there was a fix or setting for this:

I run dual displays with a maximized boost toon on the primary display and 2 of my RAF alts on the second screen. The screens are 900x600 all using the same WoW installation. The problem is this: when I move one of the alts using the PIP keys my framerate drops to about 5fps (from 45-60) and never goes back even when the toons are all back in the right order. I am assuming that I have a setting marked incorrectly or that I need to change my resolutions.

Any suggestions or additional information I can provide to make the problem a little more clear? Unfortunately searching PIP and FPS doesn't play well with the search.