@Toasty, Heavenly Sword had a whole lot more on screen than that demo did :) Heavenly Sword was processing literal THOUSANDS of on-screen characters. Games like Super Stardust HD have an INSANE amount of on-screen particles managed with the physics engine, then if you've seen the background and environments in Ratchet and Clank it's just an entirely different ball game unfortunately :(
From 0 to KICKASS in .stupid seconds.