If you feel like you’re wasting too much time thanks to Mission Control’s animations, use these commands on the Terminal to speed it up:
defaults write com.apple.dock expose-animation-duration -float 0.2
killall Dock
You can change the 0.2 value to whatever you like best, and if you want to return it to the original speed, just use these commands instead:
defaults delete com.apple.dock expose-animation-duration
killall Dock
Thanks to @bdc for the tip!