I've also noticed inconsistency with the boot and reboot times in the amount of time the bios takes to process things. Most times its quick about it but occasionally it takes an extraordinarily long amount of tome before it will start loading windows. I've also noticed that the bios version doesn't matter. I also turned off fast boo and windows fast start because of problems I was having with them.
Asus ROG Crosshair VIII Hero Wi-Fi Gigabyte X570 Aorus Master, AMD 3900X, EVGA 360 aio, 32gb G.Skill Trident Z Neo, Samsung 970 Pro NVME 512gb, WD Black NVME 1 TB, Crucial MX500 2tb, Zotac GTX 1080 AMP!, EVGA Nu Audio, CM HAF 932