Wow, this is weird. I have an iMac 333MHz with Jaguar (WWDC Preview) installed. And, I have my G4 400MHz with OS X installed (not jag). To complete a WU on my G4, it takes about...5-7 days. On my imac, it takes 17 hours!!! I know some WU are bigger than others, but this imac does 1 percent every 10 minutes!!!