Install Google’s mod_pagespeed

Install Google"s mod_pagespeed. Create a file called /etc/yum.repos.d/mod-pagespeed.repo For 32-Bit
[mod-pagespeed] name=mod-pagespeed baseurl=http://dl.google.com/linux/mod-pagespeed/rpm/stable/i386 enabled=1 gpgcheck=0
For 64-Bit
[mod-pagespeed] name=mod-pagespeed baseurl=http://dl.google.com/linux/mod-pagespeed/rpm/stable/x86_64 enabled=1 gpgcheck=0
Install mod_pagespeed module through Yum
# yum install at
# if you do not already have "at" installed
# yum --enablerepo=mod-pagespeed install mod-pagespeed
Above command creates following directories and files. /etc/cron.daily/mod-pagespeed : mod_pagespeed cron script for checking and installing latest updates. /etc/httpd/conf.d/pagespeed.conf : The main configuration file for Apache. /usr/lib/httpd/modules/mod_pagespeed.so : mod_pagespeed module for Apache. /var/www/mod_pagespeed/cache : File caching direcotry for web sites. /var/www/mod_pagespeed/files : File generate prefix for web sites. Please make sure mod_pagespeed.so file included in your httpd.conf. To verify mod_pagespeed module, create php info page anywhere in your domain or localhost and check it.

You will see "X-Mod-Pagespeed" section in the HTTP header, like
X-Mod-Pagespeed
Turning the Module On and Off If you don"t want to use mod_pagespeed completely, you can Turn Off by inserting the following line to pagespeed.conf file at the top.
ModPagespeed off
Turn On module
ModPagespeed on
Thats all..