ITunes 8.2 (23) uses 95% of CPU when playing music

Was hoping someone could share insight as to why iTunes is averaging 95% of a CPU's power while playing music.. the load is generally 75-100%. Per support doc recommendations i have disabled plug-ins (growlTunes) to no avail. Library Sharing off does not make a difference either.
This is something i've been troubleshooting for some time.. at times there were delays between tracks playing, and that called my attention to the CPU usage. I would unplug the iphone which was charging, and the CPU dropped back to 2-3%, and thought i'd won. But then i check back later in the day and the usage is up. Disable growltunes, CPU dropped down, now it is back up again and i've nothing more to disable. Such performance return could have been coincidence however.
questions:
I don't want to find i'm being robbed of performance in a crunch just because i'm playing music. Could this be because i have four processors, and iTunes is using idle processing power? at 95% i see 25% load on each processor. Does the processing power free up when i put more load on the machine?
Watching the usage through a track right now, the usage began at 5%, then rockets up to 95% for the majority of the song. But it is not always up for the whole song, it varies but mostly is in the 90's. Is this due to the complexity of the track it is decoding?
I'm using Uno to make my tiger interface consistent, but i don't believe that has any bearing on iTunes - it did not skin iTunes as it was a newer version than Uno supported.
quad g5- 8gig ram, os x 10.4.11 thanks for any input

upgraded to leopard on this machine

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