For auto-complete textboxes, there is a default delay of 200ms before the server is sent what the user typed. If the user types several keys without allowing 200ms to pass between them, then only those keys are sent together in one request should be sent to the server.
The delay can be increased to reduce the number of times the server is queried. Add the configuration option, pui["autocomplete typeahead delay"], to a settings JavaScript file.
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Where do you save this configuration option? Here.
This configuration option is available with versions of Profound UI later than Version 6 Fix Pack 2.1.