I had the same problem slow to start & very laggy on xmb.
Dose the hdd amber light stay on most of the time,pretty much on constantly??
If so then the hdd may be failing, get a copy of hard disc sentinel on your pc & use a sata dock to test out the hdd
Changed my hdd fixed the problem.
This is the hard disc sentinel result of my hdd that was causing slow lagging xmb
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