If everything else is working correctly then yeah, 99% sure it is the number of roms making it take so long, unfortunately that's an issue with quite a few emulators. If you've got a ton of roms (like say the whole set) you could try making multiple rom folders, like one for each letter or a range like A-F, G-L, etc. If there are lots of japanese ones you could always give those their own folder as well.
"I think that the problem with this video is it is highly derivative of many popular bands within the genre. Although when viewed on its own merits, it does have a deeper groove. However what it has in groove, it lacks in originality. One can't help but be reminded of such bands as Pearl Jam, White Zombie, Suicidal Tendencies and other bands that bear the mantle of so called "Alternative Rock". One is even reminded of Lorie Anderson when she wore curlers. Hehehmhm! This video speaks less to the heart and more to the sphincter. In closing, I think Korn would do well to learn more from -"