Some pages put the message about data being cached before the introduction: http://www.mediawiki.org/wiki/Special:UnusedImages
Others put it after the introduction: http://www.mediawiki.org/wiki/Special:UncategorizedCategories
The message should always be in the same position. In my opinion it makes most sense to come after the introduction (so you know what the page is about) and before the data (so the data directly follows the warning).
Version: 1.24rc
Severity: minor