I've been having the same problem since installing Tiger. I've looked in both Activity Monitor and using top, and there are no processes that use up large chunks of CPU time, even when you add up all the individual CPU times reported by activity monitor. However, I do see an occasional (approx. every two minutes or so) CPU activity bump to around 30% for about 30 seconds each time. The weird thing is that the process CPU times don't account for this increase.
There's definitely something going on...
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