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Is your Library/Application Data/ directory on a network-mounted volume?
Running bitcoin 0.3.13 on my OSX 10.6.4 Mac I'm not seeing any issues (it uses almost zero CPU when it is not generating, and 100%, but nice'ed, when it is). I don't see any DirectoryService CPU usage.
From what you've said, it looks like disk writes are chewing up lots of CPU time for some odd reason.