One of my clients reports that after having installed Windows 10 his laptop is now slow to start-up. Mind you, he is talking about only 30 seconds he has to wait between putting in his password, hitting Return and the desktop appearing (it used to come on straight away with Win 7).
Apparently it doesn’t happen every time either through reset or turned on from power off.
If it were me I would simply accept that this is yet anothe MS operating system "advancement", and simlarly I do not expect anyone out there to have a silver bullet for this, but I told him I'd ask.
“Technological progress has merely provided us with more efficient means for going backwards.” Aldous Huxley