If you put a Playstation game in a PS2 you can make the games loading times faster by telling it to use the 32X-speed CD drive. The other option filters textures on polygons to make them look "smoother". Although its hardly noicable on most games.
Maybe Nintendo could put something along these lines but I can't really say the loading times on the gamecube are worth speeding up...theres no games I can think of with large loading times.
And I don't think the Gamecubes graphics need to be made any smoother etc.