Slow boot - Windows 10 - BIOS problem?

[Mysthios]

I have a problem with Windows boot. Actually, maybe it's not a problem with Windows. There is cca 20 seconds gap between pushing power on button and BIOS message on desktop. Maybe it's a problem with BIOS. I don't know.

Motherboard: Asus Crosshair HERO VII (WiFi) with latest BIOS update

 

Another problem could be, I dont' know, I'm guessing, my boot drive is "Disk1" and storage drive is "Disk0". Is that a problem? And if it is, how to fix this?

I have two hard drives. SSD for boot is Samsuing EVO 970 250GB M.2 and drive for storage is Toshiba P300 3TB.

[MoonlightSylv]

This looks 100% like a bios problem, since you're already on the latest all I can suggest is poking around in the bios settings for things related to fast boot.

[TheGlenlivet]

Before you start making changes in BIOS, I would remove all USB except Keyboard and Mouse and see if that changes anything.  I get long delays with USB drives and backup devices sometimes.

Just to eliminate that possibility.

[SPARTAN VI]

If you're booting from the 970 PRO, hopefully Windows 10 has created its partition using the GPT partitioning scheme. If you are using GPT (as opposed to MBR), I'd wager your slow booting problem is because your  BIOS update re-enabled your CSM (Compatibility Support Module) setting. This should be disabled to fully support Windows-UEFI mode, then you'll want to go into Windows 10's advanced boot options to enable UEFI boot as well: Open Settings > Update & security > Recovery and then, under the Advanced Startup heading, click Restart now. Then select Troubleshoot > Advanced options > UEFI Firmware settings.