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#11
My vote is 'off', but on the grounds that I often want to boot from a usb. Fast Startup, being a form of hibernation and not really a 'cold start', skips the boot choice options on the BIOS screen at power up.
As for speed, well Fast Startup does seem to improve start up times for an HDD 'spinner', but then I rarely shut down my laptop. I close the lid and hibernate when I'm done for the day