ITunes 9.1.1 (12) very slow

My wife's iMac has os 10.4 with iTunes 9.1.1 (12) on it. As more and more playlists are added, iTunes is very slow to respond and the CPU usage is going up! CPU usage is averaging 40% and the fan that cools the system is running at max speed (which is very annoying).
Have attempted to rebuild the library (975GB, music, TV shows and movies) and initially it seemed okay, but with the additional playlists being added the CPU usage is going up and iTunes is slowing down.
If anyone has a suggestion, I would greatly appreciate it. My wife wants me to trash the iMac and she would just go back to listening to CD's.
Thanks,

Many things happening here.
Is this library on an external drive? You say you have a 540GB drive but then you also say, "975GB, music, TV shows and movies)." It helps to know all the parameters.
As said before, too many playlists, especially smart playlists, slow itunes. Turn off live updating on smart playlists unless essential. Playlists of any kind make your library file larger and more to read and write.
How much of your 975 GB is music, shows, etc.? If it's 95% music in mp3s that is huge. iTunes takes longer the larger the library.
Is there a way to determine (and increase) the virtual memory?
No, and you wouldn't want to anyway. VM uses the hard drive and that is slow vs. RAM.
Also, will increasing RAM help? The iMac has 1.5GB and I can increase that to 2.5 GB.
Possibly, but some of the slow down may just be the large library and the fact that iTunes is constantly using the file. If this is being done in conjunction with an external drive that could also be slowing things down (what are the specifications on that drive?) If I run iTunes and check Activity Monitor for memory usage I see I still have plenty of free RAM but my iTunes has definitely slowed down since day 1 when I only had 2 CDs in it.
What is "slow"? It may just be the way iTunes works on your computer, your computer processor speed, the demands you are placing on it, or your computer could have other issues.
I'm not sure if this works in your scenario, but consider using multiple libraries to keep them small. Do you need all your video and music in the same library? Switch between libraries by starting iTunes with the option key held down.

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