I've been usingm OS X since 10.0.3, I was running that on a Pismo 500. It was horrendously slow. But I loved the stability, and i soon found I couldn't live in 9 any more. Right when the 10.1 upgrade came out, i sold my Powerbook and bought a G4 533, Now with 10.1.3 I don't have any real big speed issues, other than i want a faster card than my ati 16 meg'er(but thats a different story) The only speed problems i ever have is that wonderous spinning color wheel when i go to some websites....but it think that is a problem with IE, It is the only program i ever have to force quit.....Once that gets fixed i will be set!😀