so consistently when I attempt to 5 box... I load up all windows... the fifth one that loads is always running at 1.6 fps or so... in order to fix it... I do a PiP Swap to that window and back and it USUALLY solves the problem. If it doesn't... my main window lags out and won't do anything while the 4 in background run at 20 fps each... (and I have my maxfpsbk set to 5 with maxfps at 20) It also hits a bug randomly where one of the windows will lag out again about every 15 minutes or so.

Specs:
Nvidia geforce 8600 GT 512 MB
AMD Phenom x4 9850 ~2.5 GhZ
4 gb RAM
1 TB HDD (though I doubt that matters)

For the most part my comp should be able to handle this I think, though granted my graphics card is a bit old (actually replaced it but got a DOA unit and is in process of being RMA'd). So what is causing this, and what can I do to prevent it? I've already tried restarting and that junk, plus when I multibox I close all other programs.

[edit]: Just saw freakinred's post on the same subject... though the answers for him don't really help me so much... but... more information that I can give from what was asked of him...
OS: XP Home SP3
Running all 5 wow's on same screen. Using Snap to grid for the PIP - resolutions are 1680x1050 on main window and 800x600 on all others. - monitor resolution is 1680x1050
using keyclone commands to open the 5 wow's
Have not set CPU Affinity though - I only get one option anyway.