Perceived Speed
Speed is perception. People are not going to measure your product’s response time with stopwatches. What really counts isn’t how long an action takes in seconds and milliseconds but how your users perceive your product’s speed.
One thing you can do to improve speed perception is to start showing partial results as soon as possible. If you are implementing a user interface for a search system, don’t wait for the search to finish before you show the results to the user. Instead, start showing search results as soon as you start finding them.
Another way of improving speed perception is to make sure that actions that take a long time ...
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