Yeah, it really was incredible to see each version get faster. 10.4 was incredible. Personally I loved 10.5, and it was plenty fast for me, but my brother preferred 10.4.I think a large part of the perception of Snow Leopard was based on how slow Leopard was. I have an old G4 that I play with, installing different OS’s and old games, and every version of OS X up until Tiger performed better than its predecessor on the same hardware in most aspects. Leopard was a huge step backwards in that regard. Snow Leopard mostly brought back the responsiveness that Tiger had. If only it had supported PowerPCs!
A lot of what improved 10.6 over 10.5 was dropping PPC support so it could be leaner and optimized for just the one architecture, so it couldn't have been as good and still support PPC unfortunately. PPC really was an incredible architecture for a long time (and still is, really), but the time had come to switch to Intel. I mean, the G4 PowerBooks were getting pretty pathetic performance wise. 😔