I was really impressed that the GoW managed some of the best visuals and largest areas on the PS2, and did it with a total load time of like 10 seconds. No idea how they managed it, although IIRC, GoWII is similarly impressive.
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Yoblazer: http://i44.tinypic.com/5nw45i.jpg
Watch and you'll see... someday I'll be... part of your world!