The "QWERTY" keyboard that we still use was designed to slow down typing on the old manual machines. The most-used letters were spaced out to make it harder to type fast because the hammers would stick.
Back in, I think, the 70's, a new keyboard was invented that bunched the most commonly-used letters in the middle of the keyboard on electric typewriters, like the ones with "type balls". With no hammers to stick, typing could go a lot faster. Needless to say, the new keyboard did NOT catch on.
Remember how the "electronic" typewriters would "buffer"? You'd be typing quickly, finish, lift your fingers and the typewriter would type on for a while.