What is the fastest way to unlock iPhone X to the homescreen? (rather than double tap, Face ID, swipe up)
You can raise the phone or press the side-button and then swipe up. You do not have to wait for Face ID to complete in between.

This is much faster compared to double-tap, wait for Face ID and swipe.

There's no way currently to access the home screen faster, for example without having to swipe up.