Anyone notice this?

If you have a PSX game for the iphone and its regularly 600 mb, and use pocketiso to compress it from 600 to 50 mbs (btw how the hell do they do this? this is far far beyond what ive expected 600 mb to 50 mb? everything is still in there and runs fine with the same quality?) It will run faster and load faster.

I just compressed my Megaman X6 game and saved alot of space and improved the speed
the game almost runs at full speed

the pocketISO program is truly amazing... Anyone want to explain to me how this is possible?