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.
System feedback
Provide system feedback within 400 ms in order to keep users’ attention and increase productivity.
Perceived performance
Use perceived performance to improve response time and reduce the perception of waiting.
Animation
Animation is one way to visually engage people while loading or processing is happening in the background.
Progress bars
Progress bars make wait times tolerable, regardless of their accuracy.
Purposeful delay
Purposefully adding a delay to a process can actually increase its perceived value and instill a sense of trust, even when the process itself actually takes much less time.
Origin
In 1982, Walter J. Doherty and Ahrvind J. Thadani published a research paper that set the requirement for computer response time to be 400 ms, not 2,000 ms (2 seconds), which had been the previous standard. When a human’s command was executed and returned an answer in under 400 ms, it was deemed to exceed the Doherty threshold.
Related Laws
Flow
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Parkinson's Law
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Postel's Law
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Accot-Zhai Steering Law
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Aesthetic-Usability Effect
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Selective Attention
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