A BIT OLD YOUR QUESTION, BUT SINCE I HAVE REPLIED TO OTHERS, HERE IT IS.
You can INDEED speed up your iTunes Library.
I'm a music lover, and in fact have a huge database. Have over 150k songs and a itunes.xml file over 200MB.
What I have seen so far are the worst problems ever. No questions about it.
This is what I did to resolve most of the slowness. Today I have a very good speed (best then ever before). Just for knowledge, when I started the testings and the problems, usually it took around 45 seconds to load itunes, and usually it hanged up while working or scrolling down the library. Today, it takes no longer then 10 seconds to load and usually it does not lock anymore.
1) There are some considerations where you store your musics (library), where you store your profile AND where you store your itunes library files.
1.1) your music you can store wherever needed. I personally have it on a RAID controller, which is much better
1.2) your profile may be a problem, better if your windows profile is ALSO on your SSD disk
1.3) the itunes library MUST be on your SSD disk.
2) BEST HINT> run you iTunes with proper privilege and put it on REAL TIME or HIGH.
Download PRIO, which is Process Priority Control. All you have to do is to change AND record that priority into the application. Real Time you may need to run itunes under your administrator account, otherwise you will have to run it under High Priority, which is basically the highest before Realtime.
3) UNSELECT "search all library" under iTunes search.
I have a Dell T110-II Server, Quad Core E3 Processor, 32 GB RAM, 128 SSD, 8TB RAID. Thus, using 3 AppleTVs and 3 Airport Express for audio.
So far, best action was to use the fastest available SSD for OS and iTunes Library Folder. Have also tried to "move" the iTunes library and run under a RAM Disk, which didnt gave the proper response. Try what I mentioned above and you will see most of the slowness disapearing.
I really dont love iTunes, but since i have so many iDevices running audio and video from my library, it was the best choice and best tunning I found. Today, it is really smooth.
By
LUIS