Well here is my unscientific assessment...
PIII 733mhz, W2k/XP, 256meg ram (with alot of junk running in the background) average time per unit 15hrs 33mins.
Celeron 500mhz, W2k, 192meg ram (not much else running)
average time per unit 15hrs 36mins.
imac 500mhz, 10.0.3, 256meg ram (my first mac only had it a week, I love it but I'm totally confused!) doing the first unit on it currently,
27% complete in 7hrs 1min.
OK this is my first mac and I don't know what I'm doing but the mac is painfully slow. I'm not getting the 10.1 upgrade till tomorrow I'll see if that makes any improvement. Anyway my P133 laptop takes 120hrs per unit so I can't really complain.
BTW Anyone know of a utility like SETI monitor to cache work units, I like to stare at the graph but cant be bothered dialing in everyday.