I have an old NP530U4B-S01FR that had HDD. I replaced it by a crucial 500Gb.
Installed new Windows 10 on it, after upgrading all drivers and updates, the boot time takes around 1m30s.
I tried following @magicandre1981 analysis in this other answer but I'm not an expert at WPA.
From what I've seen is that the Boot sessioninit-phase takes 85.67seconds which include the smss.exe but then I'm not sure where to look. I've seen that there was a atikmdag.sys somewhere, I tried to dig after that and found a weird behavior.
After uninstalling the HD 7500M/7600m driver from the device manger and rebooting I have no delay at all.
But then Windows proceed to reinstall this driver again and delay came back.
I tried updating manually the .cat driver for the graphic card, same issue.
When I try to launch the driver from AMD website, it says some DLL error.
Attached the WPA file: