"determining gapless playback" EXTREMELY slow...

[jntdroid]

Just picked up a 4S on VZW. Have had an iPhone before, so this isn't the first time I've had iTunes installed. Right now I imported my music folder into iTunes and it's doing the "determining gapless playback" thing, and it's moving VERY slow... like it will probably take days at this point. It has NEVER done this before. I can't figure out what's causing it... any help would be appreciated!