Last modified: 2014-06-06 04:05:31 UTC
Like it says on the tin.
This is useful for people who like having such things in their footers. More importantly, it might be useful when tweaking performance settings so you don't have to constantly open the page source and sift through the HTML.
Dynamic content in the footer seems like it would do bad things to cache. This also seems like a feature that would get very little use and might be better served as a live hack for sites wanting it (especially if its use will only be temporary and be only by users who are already tweaking performance).
(In reply to comment #1)
> Dynamic content in the footer seems like it would do bad things to cache.
It is in the HTML one way or another - how does it matter whether it is visible or not?
It's not a caching issue, but I really don't see the need.
See http://es.wikipedia.org/wiki/Usuario:Platonides/tiempos.js as an example (it replaces the logout link with that info).
During development this can be displayed in the (much more advanced) Debug toolbar via $wgDebugToolbar.
I agree with Chad and don't see a need for implementing a way to display just the response time somewhere visibly rendered in the page HTML.