Guys, do not take it anymore.

ITunes is almost always catching my Mac OS X! The machine becomes so slow that if I close it running, I must reset button through the front of the CPU.
I have looked everywhere and I find no explanation for this fix.

And the worst is that there is another player who really is worthy of replacing iTunes on Mac OS ...

It happens on my work PC and my daughter's PC (both Snow Retail 10.6.3 and updated to 10.6.7 one x86 and one for x64 10.6.8).
One is Realtek ALC889 and the other Realtek ALC883.

Somebody help me, please!