We would like to provide our tables with generic search field that will filter entries where at least one of the columns contains the input text. We also think of providing auto-completion for this search field in some way or another. To make it clear, it is the kind which filter/auto-complete while (user is) typing.
My questions: is there a recommended minimum characters limit before the filtering mechanism gets into action?
Case there is no performance issue with searching a single character, should there be a minimum anyway? or that this practice became common due to performance issues.