Doherty Threshold
Productivity soars when a computer and its users interact at a pace (<400ms) that ensures that neither has to wait on the other. The Doherty Threshold suggests when a computer or device responds quickly to a user's input, it can improve the overall user experience. It's named after Walter J. Doherty, who conducted research in this area. When you click or tap something on your computer or smartphone, and it reacts almost instantly, it feels better for you as a user. It's like when you press a button, and something happens right away, which makes you feel more satisfied with the technology you're using.
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