problem with render time with dv footage??

i have rendered 18 min of green screen footage key out using primatte keyer pro 4.0 .
green screen footage on V2 and back ground on V1. time line set to RT unlimited,nothing else done to time line and it takes just under 14 hrs to render. I have no idea why it's taking so long no other program running in back ground. i have tried 3 times with same results making new projects. footage is on separate internal hard drive than OS . video hard drive is a 500 gb with 420 gb free. i have a quad core with 4 gb ram and a ati radio card with 512 of on board ram. i'm using FCP 2 with Leopard mac os version 10.5.6 i have an 500 gb firewire external for archiving resent project less than 3 months before shelf archiving.
when i do this in CS3 Ppro i render less than 50 min . when i export out it fine no problem there but the render time is a killer.

anybody have andy ideas???

the real fun begins when the program loads
running FCS 2 & CS3 MS side by side on the Mac