Moment Quote by Jeff Johnson
““0.1 second: This is the limit for perception of cause-and-effect between events. If software waits longer than 0.1 second to show a response to your action, cause-and-effect is broken: the software’s reaction will not seem to be a result of your action. Therefore, on-screen buttons have 0.1 second to show they’ve been clicked; otherwise users will click again. If an object the user is “dragging” lags more than 0.1 second behind the cursor, users will have trouble placing it. This 0.1-second deadline is what HCI researcher Stuart Card calls the perceptual “moment.” It is also close to the limit for perception of smooth animation: 0.063 second/frame (16 frames/second)””
About This Quote
Source Book: Designing the User Interface, 1995
Human-computer interaction requires responses within a tenth of a second to maintain a sense of immediate cause and effect.
In simple terms: Fast feedback feels immediate.
Key Takeaway
Keep UI responses under 0.1 s.
Themes
usability
performance
human perception
interaction design
Mood
focused
alert
responsive
Type
technical
practical
educational
When to use this quote
- button clicks
- drag‑and‑drop
- real‑time editing
- gaming controls
Key Concepts
cognitive latency
feedback loops
animation smoothness
Questions to Reflect On
- How does perceived delay affect user trust?
- What design tricks can mask slight latency?
A Different Perspective
If users are distracted, even sub‑0.1 s delays may be tolerated, reducing the strictness of the rule.
