An interaction class defines how much time is expected to reach a time point, the response time point being the most commonly used. The interaction classes correspond to human perception,so, for example, all interactions in the Fast class are perceived as fast and roughly feel like they have the same performance. By defining these interaction classes, we can describe performance using adjectives that have a precise, consistent meaning.
|Name||Target (ms)||Upper Bound (ms)||UX / Feedback|
|Instant||<=50||100||No noticeable delay|
|Fast||50-100||200||Minimally noticeable delay|
|Typical||100-300||500||Slower, but still no feedback necessary|
|Responsive||300-500||1,000||Slower yet, potentially show Wait cursor|
|Captive||>500||10,000||Long, show Progress Dialog w/Cancel|
|Extended||>500||>10,000||Long enough for the user to switch to something|