Manual:$wgAllowSlowParserFunctions

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<translate> Performance hacks and limits</translate>: $wgAllowSlowParserFunctions
Allow slow parser functions.
<translate> Introduced in version:</translate>	1.7.0 (r15276)
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	(boolean)
<translate> Default value:</translate>	`false`
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

Enables the magic word {{PAGESINNAMESPACE}}. After that, you can go to Special:Version to check for the existence of the proper parser hook.