I just posted a very related message, so will repost here:

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hello

i installed bitcoin-qt (0.8.2) for mac osx (mba), and whenever i run it, it takes up all the cpu. is this normal or happening to anyone else? maybe i am missing a setting somewhere?  as a side note, i found a nice free command line tool to throttle processes http://www.willnolan.com/cputhrottle/cputhrottle.html that seems to work well.

cheers.
jd