Better than the original, for starters, but then, that's not a particularly hard thing to achieve.
And as for the comment a couple above mine, about the Slim & Lite PSP playing games faster, that's rubbish, it runs exactly the same as the original, except it's thinner...and the backlight is lighter, rather obviously.
Just wanted to let people know that so you don't get mixed up by these gibbering fools.