ITunes 10 slow when writing to disk

Hi Folks,
I'm running a pretty stout machine (by iTunes standards) and am having serious user experience issues. Whenever I try to play a new song, change the rating, checkmark, etc. and iTunes has to write to the disk (I assume to the library file) the UI hangs for 30 - 90 seconds. Playback of the song (if it was already playing) is not affected; however, I cannot click anywhere within iTunes and it becomes completely unresponsive. It does queue up the clicks though... so if I clicked 5 stars then pause it would take 30-90 seconds to execute the first command and then would pause.
I am running 64-bit iTunes 10.3.1 on Windows 7 64-bit.
My computer is an AMD Athlon X4 630 (2.8GHz quad-core) with 4GB RAM.
iTunes library files are on a 500GB WD Blue drive (7200 RPM) and media is on a 1TB WD Green drive (5400 RPM).

I'm having the same issue. iTunes was on a 2nd internal hard drive in my machine. I had about 500Gb of movies fine no problem. Started putting stuff onto a NAS then the slowness began.
The transferred the NAS content to a new 3rd internal drive. Still slow as ****. (just as you describe). When writing to disc there's a pause (e,g when backing up iPad iTunes becomes unresponsive during every transfer of an app)
Any suggestions?

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heads 16 16
sectors/track 63 63
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LBA48 user addressable sectors: 398297088
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* WRITE_BUFFER command
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ITunes 10 slow when writing to disk

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