Fast Startup might actually be slowing your PC down
Fast Startup might create more problems than it solves

Fast Startup on Windows is meant to speed up the boot time. By putting the computer into a hibernation-like state by saving the system state to the disk, the next startup is faster than a cold boot. Unlike hibernation, it doesn't save your open programs and processes to the drive, but it's still beneficial. That said, Fast Startup can amount to little time savings and a lot of weird Windows behavior. For users running Windows on a modern SSD, Fast Startup can be safely disabled. Enable it only if you experience a significant slowdown in the boot time.