Translations:Help:Extension:ParserFunctions/263/en

$ifexist is considered an "expensive parser function"; only a limited number of which can be included on any one page (including functions inside transcluded templates). When this limit is exceeded, any further $ifexist functions automatically return false, whether the target page exists or not, and the page is categorized into $category. The name of the may vary depending on the content language of your wiki.