Useful responsiveness buckets

The following bins of responsiveness (i.e. response times) based on HCI research at Carnegie Mellon University resonnate with me:

  • Crisp: < 150 ms;
  • Noticeable to annoying: 150 ms to one second;
  • Annoying: one to two seconds;
  • Unacceptable: two to five seconds; and
  • Unusable: > five seconds.

The context in which these bins were described appears in the March 2006 issues of IEEE Computer: “Quantifying Interactive User Experience on Thin Clients.”