I have a MacPro, but use my old G4 as an office machine. I'd like to upgrade from 10.4.11 to 10.5 so I can use TimeMachine on it. It's a Sawtooth motherboard running 2GB of ram and a 1.2 Ghz processor upgrade in it. My question is: will I see a performance decrease if I go from 10.4 to 10.5? It's still quite usable as is, but if it slows down any it'll become a boat anchor. Thanks for any advice.