Windows 10 Boot Weird Behavior

[TechNovice0010]

Basically a big annoyance, boot time increased from few second to 20 seconds.The problem arrases on start up after full shut down.First there is monitor logo(with bios prompt),then there is windows start up sound and then nothing for 10-15 seconds,just black screen with cursor before windows login screen. I don't know what happens for that 10-15 seconds but that wait is annoying because it wasn't happening before.I turned off all programs at start up,i tried with fast boot on and off ,nothing changes it...I have Samsung 960 pro so that shouldn't be a problem.I checked even if it was problem with win10 but on other pc with 970 evo plus it doesn't happen,it shows monitor logo and then straight on login screen(full start up is just 10 seconds which was similar for my pc but now it has that blsck screen delay).It is not big issue but it is very annoying,can somebody point me what to do or tell why it happens. Maybe it is problem with monitor?But i don't think it is the case.

Thanks in advance!