They download at the same speed as PS2 games. If we're gonna talk about capacity, a lot of PS2 games aren't too large and apparently UMDs can hold up to 1.8gb.
"NintenDON'T sue me please haha"
I would expect a long download time from PS2 and Wii ROMs seeing as they are probably bigger games. But is my internet and/or PC just being slow or are PSP ROMs suppose to take this long to download?