I've explained how to install memcache, htmltidy and csstidy on your centos machine. However, the most important thing that every webmaster should know and enable would be your gzip. By default, cpanel did not enable gzip for you. You will have to access your cpanel to enable gzip yourself. This can significantly increase your website speed and its a must to do list if you are a webmaster. In order to enable your gzip, you will have to access your cpanel. Once you are in your cpanel, find the following icon.
and click on the following option.
And click update. It is that simple to enable gzip for your shared hosting and speed up your website!