CRI, a Japanese middleware provider, are promoting what they call File Magic Pro; software that allegedly reduces the load times in PSP games by half via game compression and expansion, and file placement optimization.
Among the games that already implement this solution are Persona 3 Portable, Soulcalibur: Broken Destiny, Valkyria Chronicles 2, and Mana Khemia 2 Portable.
Perhaps Square Enix would be interested in utilizing it for Kingdom Hearts: Birth by Sleep before releasing it in the west? After all, they’re already making other tweaks to the game.