This is a tracking category. It is used to build and maintain lists of pages—primarily for the sake of the lists themselves and their use in article and category maintenance. It is not part of the encyclopedia's categorization scheme. More information: This category is hidden on its member pages—unless the corresponding user preference is set. These categories are used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience. These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

This category is populated automatically by the MediaWiki software. It lists articles that issue too many expensive parser function calls. As of 14 October 2010, expensive function calls are #ifexist, {{PAGESINCATEGORY}} and {{PAGESIZE}}. These pages should be edited to reduce the number of expensive calls. For a list of MediaWiki-populated tracking categories, see Special:TrackingCategories. Templates and modules which cause pages to fall into this category should use {{expensive}} at the top of their documentation sub-pages.

API calls that return xml formatted lists

• Article namespace (talk)
• Template namespace
• By date