Install on your webserver

Pre-built binary packages for Apache
Download packages
Build from source on Nginx
Download source

Read documentation

Read how to enable the module and adjust it for your system
Module configuration Release notes

Get support

On mod-pagespeed-discuss or ngx-pagespeed-discuss you can ask questions and get help from the developers and other users.
Apache Nginx
If PageSpeed isn't working correctly on your site, file a bug and we'll look into it.
Apache Nginx