ok.. i got some more info on this from a reliable tech type (could i get more vague?!)

anyhow... here's the thought. if you have 2 graphics boards (like i have now...) and you have 1 monitor per board (i was looking to max out gpu performance)... then a pip swap would be moving the surfaces from the memory of one graphics board, across the system bus, and into the other graphics card memory. the slow down here would be the bus speed, system memory, and also the mainboard (grrrr)

one thought i had after discussing this with him was.... what about pip swapping on the same board? would there be a similar memory shuffle between display buffers on the same card?

he also ran a simple test.. his (very high end) system was running his wow @ 2560x1600 (i think) on one screen and was getting 130 fps. if he slide the window so it spanned the two displays, the fps dropped to 90 fps (still good, but that was a ~25% drop).

my thought was, if just 1 vertical column of pixels were to overlap, that would drop the fps by 25% or more.

therefore... try reducing the width and height of your region so its definitely within the display

i hope that helped.

Rob

(if anyone has any other info on the process... please post it or drop me a note)