People seem to be confusing what's on the disc with what's in memory. While it's true the game does have a ton of stuff on the disc, not all of that is in memory when you're racing. All that's there is one track, six cars, the control setup, HUD, and five AI routines. That's all.. the same thing that's been in every race since GT1.
And for those that think it's going to take longer to load because it's a "big" game.. I repeat.. one track, six cars, the controls, HUD, and AI. And that's not going to take any longer to load than it ever has. In fact, I think the AI takes longer to load than anything else. On the Toyota demo, the only time you see any load times is when it's loading up one of the replays. When you're just playing (time trial), load time is virtually nonexistant, the load screen doesn't even have time to fully appear before you're at the track.