I am glad to see somebody write this because it still astonishes me that I'm faster than the computer. I don't want to wait before I'm ready to input things, I know it can work faster!
There are two sides to it - poor choices leading to performance issues, forcing the computer to wait, and also animations that completely halt UX until they are complete. Not much is more annoying than the seldom-overridden 300ms javascript click delay on touch devices, or the iOS animations that waste a lot of time.