Template:Slow/doc

Used to denote expensive functions that can cause performance issues.

Background
This template was written by wikia:User:Maiden_taiwan after the DPL  keyword hurt performance on his MediaWiki system significantly. On a MediaWiki site with 100,000 articles and 3,000 users, this DPL took 2.5 minutes to run:

namespace= createdby=someuser

People were making these DPL calls all the time to find out what articles they had created. When two of these ran at once, it significantly hurt wiki performance.