if your issue is that your windows are jerky... as you spin all windows at the same time... i would guess that is an issue with wow providing the rendering on the machine.

try this... run all 5... put WASD on DNP.. show the FPS... then spin a single window. do it with the mouse... see if your fps drops (as it should)

not, push the left arrow... spinning all windows at once... and you'd get the jerkiness at that point. my guess is that its wow rendering 5 wows at once.