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The biggest background drain on my MacBook Air is DropBox. It keeps trying to make a network connection when there is no wi fi available. Pause syncing on DropBox and the battery life improves.



And then as soon as there is, slam an entire core for about 30sec to calculate diffs. [MBP Quad i7, 16GB, 500GB SSD].


If it makes you feel better, Dropbox does the same thing across a few cores on my Xeon E5 under Mavericks.




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