When I was looking into this Cinnamon OS to use on my second PC I came across these 2 useful pieces of information regarding UEFI, they were from some Linux user group who as far as I could tell were a very knowledgeable forum in the Linux world, use the information I received from it or not, its up to you.
Fast Boot function in BIOS?
Before you setup the Fast Boot function in the BIOS, please check the Partition Style of the primary hard drive. The Fast Boot function can only work when the partition style is GPT.
UEFI Secure Boot - should it be used or not?
Do not use UEFI Secure Boot, when they created the UEFI BIOS we were informed that it was solely for the sake of our security, in reality that is complete hogwash, it was created to make it harder to install Linux or any other OS apart from a Microsoft Windows one onto a new PC.
__________________
|