I read that repairing the Disk Permissions in Disk Utility every once in a while will increase the performance of my MacBook Pro. I did it, but I am not quite sure what it did to it. Anyone know? I'd like to know what it does if I keep on doing it.
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What does Repairing Disk Permissions actually do?
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No, won't make any difference for system performance.
This article, though about 6 years old, is still relevant.
http://www.macworld.com/article/1133684/maintenance_intro.html