And even that official video is massively underplaying how fast these steppers (and in turn: all the mechanics around the mirrors) work. Look at this video at ~44:20 to get a better feeling

https://www.youtube.com/watch?v=sh33GG7prfA

You can link straight to a time index, eg. https://www.youtube.com/watch?v=sh33GG7prfA&t=44m20s

..and then he adds these movements need to have nanometer precision. WHAT?!

The platen is accelerating at 32g, speeds over 100kph, with a precision of FOUR SILCON ATOMS. That is absolutely astounding. What a beautiful machine