Are you on a PC or a mac? I use a mac and it seems to run fine for me. One thing I really hate about it is the way it imports music. It has to take the song from wherever it is on the computer and import it into the itunes folder, so I end up having the song in multiple places. And then on top of that it imports the songs in whatever setting you last used. And because I have to convert audio files alot it imports them in AIFF which takes up alot of space. Why cant it just ask me how I want to import the song.
PC
maybe i need more RAMs
No, you don't. I have 4GBs and it runs like shit. iTunes just doesn't work well with Windows, but I use it to organize my complete albums, since I put those on my iPhone and I put my P2P songs on my Zune and organize them with Zune.
As far as import settings, FoC, have you actually tinkered around the settings? When I import things I have iTunes import it to my desktop and manually move it where I want it to go, and then add it to the library from there. I'd imagine that's a hassle for mass imports, but I manage.
As far as BUYING things from iTunes, I dislike having to go through the whole burn/rip process to take the write-protection away. I just did it to around 11 CDs a couple days ago and it was just a hassle.
iTunes is a great program, just don't trust it, it's imperative that you do 90% of everything in that program manually, because iTunes loves to fuck it up when you aren't looking, which is why Importing CDs is defaulted to fucking AAC.