First thing I do on any new Android phone. It's also a great parlor trick, people are almost always amazed you can make their phone "faster" in under a minute.

For those who don't know, enable Developer Options, then change "Window animation scale", "Transition animation scale" and "Animator duration scale" all to "0.5x". It should really be the default and I'm surprised there isn't a "0.25x" as of yet.