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As pure UX answer the cost of autocomplete should not be a factor but understand the reality of need to deliver the UX. As a user I would want zero delay. As I key in fast or slow the possibilities get refined instantly. This is a UX site but as a developer I would say don't make every key stroke a database query. Once you retrieve everything name that ...


It's quite common to wait for the second or third keystroke, then add a pause based on the Keystroke Level Model - http://en.wikipedia.org/wiki/Keystroke-level_model Although if you have a very robust backend and matching system, you could just set your delay to 0 as Google does on some of its auto suggest processes. You might also be able to do some ...

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