Page Speed ​​is an open source project started by Google to help developers optimize their web pages by applying best practices in web performance.
Page Speed ​​began as an extension of the open source browser, and is now deployed in third party products as Webpagetest.org, Show Slow and Google Webmaster Tools.

How it works :

The Page Speed extensions run performance tests on the basis of a set of best practices known to reduce page load time.
mod_pagespeed, the Apache module, automatically optimizes the resources in a web page.

Installation:

First you need to download the module from here:  mod-pagespeed download

Then run the following commands to install it:

dpkg -i mod-pagespeed-*.deb
apt-get -f install

After you installed the plugin you must restart the apache2 server.

/etc/init.d/apache2 restart

Configure mod_pagespeed for using  on VirtualHosts:

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