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Performance
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Overview
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* For a general overview use ``Activity Monitor``
* For an extension in the menubar use ``Better Menubar`` from the App Store


Analyse cpu, mem and sys internals
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* Use good old ``top``


Analyse disk / filesystem
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* To use ``iotop`` you need to disable system Integrity protection (one can configure it to only allow dtrace, see forensics section)
* ``fs_usage`` shows filesystem activity in a continuosly updated list