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@JonoMarshall
Repairing permissions is now a myth, it helps somewhat with older versions of OS X but is now a waste of time, it can be useful when you have badly written apps with multiple users and have tinkered with universal prefs, but it is extremely unlikely that a sluggish system that is under 3 years old needs anything done to permissions.
Applejack is an easier way of repairing permissions on an old version of OS X if you have lost the start-up disk and have corrupted a user, but again, it is extremely unlikely that you will ever need to use it. The process of browsing the internet, installing the app and tinkering with it will is more likely to do damage than it is to help you, you can also repair permissions/caches/disks without the utility (through single-user mode or from clean host machines) which I would suggest as a better alternative.