It is incredibly slow. Granted, I'm using iTunes on a Windows PC, which means I have a non-native performance penalty already, but I'm using a Core i7 3Ghz Quad Core PC with 12GB of RAM. It's not exactly a slow machine!
My Music collection is 140GBs. Maybe a bit on the large size? Scrolling through albums requires waiting several seconds to have the screen draw the user interaction.
I have to manually add music acquired outside of the iTunes music store into iTunes. Most of my music doesn't come from iTunes as it's the most expensive music store online. I'm sorry, but I have a computer to avoid doing tasks that can be easily automated! I guess this isn't an issue if you only buy music via iTunes. Maybe I'm too cheap, but I refuse to pay CD prices for digital media. On a related note, there is no way in iTunes to see where the file that represents that song is.
I could go on but I have to get back to banging my head against the wall here.
Update: I can't transfer the two newest playlists I created due to "unknown error". Thanks iTunes.
Update2: Went back to editing. iTunes up and deleted one of my playlists. POS.
Update3: I chatted with some Mac users over lunch. Apparently my problem were:
- I wasn't using a MAC
- I don't allow iTunes to manage my music
- I don't buy my music through iTunes