Mac OS X 10.3 Panther - Page 3 - (11/2003): "Panther comes on four CDs: three discs for installing the OS and one disc containing the developer tools." crikey, that's a big install package.

Mac OS X 10.3 Panther - Page 5 - (11/2003): "But 'perceived performance' is where Mac OS X has always suffered. As far as the user experience is concerned, if it 'feels slow,' it is slow. Panther has improved here as well. I am hard-pressed to find any part of the user interface that does not feel noticeably faster in Panther than it does in Jaguar."

AppleInsider - Panther videos holy cow, check out the 3rd video on this page. WOW!