Pavel Fatin discusses human and computer factors in reducing latency for typing. post 
Obviously, what you type is much more important than how you type it. Nevertheless, low-latency visual feedback can often make the process more efficient and more enjoyable.
- Use a responsive editor (makes the most difference). - Use a low-latency keyboard, if possible. - Choose programs that add keyboard hooks wisely. - Turn off “image enhancers” in you monitor. - Enable stacking window manager in your OS.
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I want to spend more time with this one. I briefly wandered through some of the links in the early parts about human factors and immediately found resonance with things I teach my aikido students.
Ward poses with his Kent "squeeze key" paddles. source
Morse code is difficult to send without hearing the sound of the letters as sent. With a straight key the operator controls tempo, weight and swing. With an electronic keyer these "expressions" are erased as perfect dits stream out. But, that one can spell with two vertically-oriented switches, at 60 words per minute, is a feat of ear-hand coordination.
An iambic electronic keyer is sometimes called a squeeze key because the operator presses two switches together carefully synchronized with the generated sound. Some versions have a "dot memory" which allows the operator to get ahead of the sound and not loose dits in the process. wiki