OK, I have added a brief explanation just before editrate variable in the HTML source.

2010/4/13 Platonides <platonides@gmail.com>
emijrp wrote:
> Hi all;
>
> The counter page is generated every 5 minutes, using the last data
> available in site_stats table for every wiki project. So, the editrate
> can change every 5 minutes, I think that it is a good estimation.
>
> Regards!
>
> [1] http://www.mediawiki.org/wiki/Manual:Site_stats_table


You should document it a little. Just a link there to a page saying
that. I think this is not the first time this discussion arises.
Technical people will start wondering when seeing a javascript counter.


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