[SimpleSnake]

I do like that site, never bothered much with their compatibility list, as I find many of the games listed incompatible there should not be. Most of them there run hdloader_.7

PS2HD - -USBExtreme/USBAdvanced is actually an original application that is used to run games from a USB HD using the USB slot on the PS2. This method is slow but still worth checking out and the only method available for slim-lines that have not been modified to reinstate an IDE cable with HD-Connect.

There should be a newer version coming out soon.
Game Loading Speeds
HD 3 sec - 4 sec
USB 6 sec - 7 sec

Take into account hard drive types and seek times. An IMB would be faster than a seagate, but cost you an arm and a leg. I think they also will do data recovery for free until your warranty is up.
Seeing as how even some games on the usb have to be run under a slower mode for compatibility issues, I cannot agree it's slower than the dvd drive. Also take into account dvdr backup load speeds,

Bottom line, if you have a slim you're not gonna win any races with hd seek times unless you mod your console, personally I don't care to do that. You want an internal that badly? Trade models with one of your friends that has the older fat Ps2 model, problem solved!