There are different tags for [mod-pagespeed][1] and [page-speed][2], but these seem largely the same tag. They should be synonymed.

this is the tootip infos

* mod-pagespeed

> PageSpeed Module speeds up your site and reduces page load time. This
> open-source webserver module automatically applies web performance
> best practices to pages and associated assets (CSS, JavaScript,
> images) without requiring that you modify your existing content or
> workflow.

* page-speed

> PageSpeed is a WebServer module that automatically optimizes pages and
> the resources they use. Google offers it as a free service through
> their DNS product.

  [1]: http://serverfault.com/questions/tagged/mod-pagespeed
  [2]: http://serverfault.com/questions/tagged/page-speed