Then again, I'm used to an original GeForce3 on an ABit IS7 mobo. My dad's friend just bought a P4 3Ghz laptop from Dell, and I swear it was less responsive than some Celeron 500 desktops.
I find it hard to believe that OS X runs even acceptably on older Macs.
I think that 'responsivness' is a highly sujective measure. I find MacOS X 10.2/10.3 pretty zippy on my Dual 1GHz, earlier version looked too slow to me. Then again it doesn't even look as responsive as my A1200 with a 40 MHz 040 but I think this depends heavily on what apps you use. Anyhow w/o some eye-candy MacOS X is acceptable on older Macs, what it needs desperately is a bunch of RAM, 256 megs are an absolute minimum if you don't want to hear it swap brutally every time you launch an app.
