Yesterday I found that boot-up process is slowed down while there's plugged any USB stick or USB ext. HDD. It takes additonal 5 seconds during boot proces (and it doesn't matter if I have enabled in BIOS "Fast boot" feature, and internal SSD is set as 1st in the list). Looks that NUC allways checks USB plugged devices during boot
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I have tested several devices and it takes about the same time to boot with Windows 10.
I’m not sure if this is occurring with other operating system, please take a look to the following links.
You can see Windows 10 slow boot up issues at:
You can also see How to fix slow boot-up issues here:
NOTE: These links are being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
The more USB devices that have to be discovered, the longer BIOS POST is going to take. Having external USB hubs connected will add even more time. Once you have your hardware configuration stabilized, you can enable Fast Boot in the BIOS. This feature simply ignores USB and proceeds to boot from the SSD/HDD/SSHD immediately. Note that, if you do enable Fast Boot, you will not be able to use keystrokes to enter Visual BIOS (BIOS Setup) during the boot-up process. In this case, you need to hold the power button for longer and use the recovery menu to enter Visual BIOS...
Hope this helps,
Situation is little bit different - I have enabled Fast Boot all the time, but directly after turning on NUC, you have to quickly press 20 times F2 and you will enter BIOS. If you quickly press F9 instead of F2, you'll see bot options. And regarding fast boot, turing on, off NUC and USB devices - event I have Fast Boot enabled, once I plugged there also external USB hard drive 5400rpm, boot process is slower (additional 5-10 seconds) and shutdown procedure is also slower (another 10 seconds). When I remove that USB 5400 HDD, eveything is quick