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It eventually goes away and the machine shuts down or re-starts (actually, I shut down this morning, prior to coming to work and found the mbp hot with the fans running - meaning it didn't quite shut down when I closed the lid). Has anyone else Hi, I just got off the phone with Apple support.
They told me to go into my login items under my account in the system preferences and delete all but i Cal and i Tunes Helper.
To reboot a Mac directly into Safe Mode, the same logic applies, but you initiate a restart from the Apple menu Restart.
Mac OS X uses a boot-time optimization (effectively a smart read-ahead) that monitors the pattern of incoming read requests to a block device (the boot disk), and sorts the pattern into a "playlist", which is used to cluster reads into a private cache.
This "boot cache" is then used for satisfying incoming read requests, if possible.
Sometimes it might help particular app performance, but usually it does not.
If you don’t have a specific reason to clear Mac caches, don’t do it.