[herrvogel-]

You can change the animation time from the terminal [1]. There was some awesome list on GitHub that had a nice script that changed most system animation to a minimum, but I can’t find it right now.

[1] https://osxdaily.com/2012/02/14/speed-up-misson-control-anim...

[systemvoltage]

This is long gone. No longer possible.