There are different tags for mod-pagespeedmod-pagespeed and page-speedpage-speed, 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.