Responsiveness as a concept of computer science refers to the specific ability of a system or functional unit to complete assigned tasks within a given time. For example, it would refer to the ability of an artificial intelligence system to understand and carry out its tasks in a timely fashion. It is one of the criteria under the principle of robustness (from a v principle). The other three are observability, recoverability, and task conformance.
Software which lacks a decent process management can have poor responsiveness even on a fast machine. On the other hand, even slow hardware can run responsive software.
It is much more important that a system actually spend the available resources in the best way possible. For instance, it makes sense to let the mouse driver run at a very high priority to provide fluid mouse interactions. For long-term operations, such as copying, downloading or transforming big files the most important factor is to provide good user-feedback and not the performance of the operation since it can quite well run in the background, using only spare processor time.
There are many factors that can influence the responsiveness of an interaction system, such as poor design, improper input from users, problems with the operation system or the network. It is generally a good practice to have the designer(s) of the system play the role of the user and run diagnostics to determine if it causes any unreasonably long delays.This will allow them to affect any changes that need to be made before the system is introduced to the users worldwide,thus avoiding such problems earlier on in the systems life-cycle.
Long delays can be a major cause of user frustration, or can lead the user to believe the system is not functioning, or that a command or input gesture has been ignored. Responsiveness is therefore considered an essential usability issue for human-computer-interaction (HCI). The rationale behind the responsiveness principle is that the system should deliver results of an operation to users in a timely and organized manner.
The frustration threshold can be quite different, depending on the situation.
The three steps are 0.1s, 1s, and 10s.
Although numerous other options may exist,the most frequently used and recommended answers to responsiveness issues are:
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