Should I enable fast boot?

Leaving fast startup enabled shouldn’t harm anything on your PC — it’s a feature built into Windows — but there are a few reasons why you might want to nevertheless disable it. One of the major reasons is if you’re using Wake-on-LAN, which will likely have problems when your PC is shut down with fast startup enabled.

What is fast boot in UEFI?

Fast boot is a way for Microsoft to sidestep the complaints millions of users had about boot waiting times in Windows. Rather than having to wait ages for the OS, then the desktop and then your apps, Windows 10 tries a different approach.