Oddly enough, i had more problems with the vista windows, where my foreground focus window would have bad fps and a background window would be getting 30+ fps. never bothered to track the problem down - went away when i limited the background window fps with keyclone. But yes, horisontal span can work well - thats where the matrox box can come in handy for some people. I would use the triplehead version for 2,3 and 4th screens until i got a second video card at which point i went to extended desktop for all.

(can a mod delete one of my double posts above plz? i cant seem to do it myself)