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Fast booting in bios and fast startup in Windows 10 are two different things.

Fast booting in bios reduces the number of things the bios checks for when booting - it basically reduces your chances of being able to hit the key to enter bios setup and/or the custom boot menu. Fast booting in bios gets to loading the boot files from the HDD/SSD faster. Having an SSD vs a HDD doesn't really affect that too much.

Fast startup set in the Windows 10 power menu does a couple of things. When it is enabled and the computer is shut down, a lot of system information is stored in a hibernation file on the HDD/SSD . Then Windows 10 sends a signal to the bios that says shut down the computer - but don't reset it to a state where it boots up from scratch. Instead go into a state that reads the system information stored in the hibernation file on the HDD/SSD. This also prevents you, usually, from having the option to press the key to go into bios setup or the custom boot menu when the computer restarts from this state. With a slow HDD, it's usually faster for this information to be read from the hibernation file than it is to recreate it upon startup. With a fast SSD, the difference between reading it from the hibernation file and recreating it from scratch is minimal. I don't like having some of the options taken away when Windows 10 fast startup is enabled, so I have it turned off on my computers which have SSDs.

i didnt know windows had a fast startup also. never looked so hard.. anyway. i'll look more into it when i get back. have to use the idiotmobile

just read some of the fast startup in windows. turned it off and set the hibernation file to reduced. since i just want it to normal standby \ sleep mode.

thanks for that :)