I have an old UH572. In Windows 8.1, the boot time when on BIOS boot (seeing the Fujitsu logo on screen) could be very long already (in minutes).
I recently upgraded to Windows 10 x64 and changed the HDD for a Samsung Evo 850 SDD but this problem did not improve. Upgraded also to the latest 1.xx BIOS version available and performed a BIOS reset. Still no improvement.
Fujitsu HW diagnostic did report no problem.
Does anybody have a hint on a potential solution ?