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There is no real equivalent in OS X, but if you're looking for some optimization routines, try running OnyX or Maintenance.
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Ahem, have you forgotten about repairing permissions?

This is OS X's answer to repairing the desktop: Apps/utilities/diskutility/repair permissions
OnyX is a great program and you should probably download it, but disk utility is already on your system and is great for 90% of your computer errors you're going to face with normal computer use. Run it once a month or so. Keep your hard drive clean as possible for best performance.