ITunes 9.1 - CPU goes to 100% when playing prot. AAC - clicks and gaps

Since downloading 9.1, there are clicks and gaps when I play protected AAC songs on iTunes. Songs play fine with QuickTime player. When a protected song is played in 9.1, iTunes absorbs all available CPU.
I have followed all remediation steps in the apple.com support site including turning off sound enhancer, checking for driver updates, etc. I have also set buffering to maximum.
If I play an AAC protected song for more than a few seconds it becomes impossible to pause it and all other applications running freeze. This happens even when there are no other applications running . . . it is not a conflict problem with other applications. itunes absorbs whatever cpu there is left to take. Consistently using 60-90% of CPU w/ total CPU @ 100% constantly (when an AAC protected song is played).
iTunes works fine as long as the song is not protected.
I cannot find anything on the apple site to allow me to go back to 9.0. Why can't apple allow one to step back to the previour version? I am seriously looking at getting permanently off of iTunes. Each new release is harder to use and performs more poorly.

Unfortunately I have the same problem since I installed Itunes 9.1 anche this problem is shown in a lot of thread.....
I am seriously disappointed cause I BOUGTH these music and it's unbelieveble that Itunes doesn't play its music (sorry for my english...I am writing from Italy...).
I am afraid that it's an Intel Atom processor conflict.
I have already update everything was possible to update (driver, codecs, setting audio configuration, energy saving...) but I didn't find any stuff to solve this issue...

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