The "hardware profiling" you are referring to I presume is ureadahead.
No, this doesn't profile on every start. It is my understanding that it
periodically updates the cache file once every month, and only forces a
re-profiling when installing/upgrading certain system components.

Is the cycle that you mention persistent/reproducible?

Regards
Iain

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During first boot system is extreamly slow
https://bugs.launchpad.net/bugs/512410
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