the performance of the pip swap is crushed by re-rendering the surfaces it needs to draw the scenes.

this is why you must make sure all the windows have the same aspect ratio.

of course, the level of details you have in the scene that needs to be re-rendered impacts the amount of work the card has to do
(check: http://www.dual-boxing.com/wiki/inde...Graphic_Detail )

the next biggest impact would be the graphics card.

after that... maybe system memory and bus speed on the main board