Translations:Help:CirrusSearch/292/en

A query with no namespace specified and no prefix specified searches your default search domain, (settable on any search-results page, i.e. at $ss). Some users keep their default search domain at "all namespaces", i.e. the entire wiki. On a large wiki if this user does a bare regexp search it will probably fail, incurring an HTML timeout, before completing the search.