How to Speed Up Your Joomla Website
jFinalizer for Joomla is an excellent Joomla Website Optimization tool.
http://extensions.joomla.org/extensions/core-enhancements/performance/site-performance/11366
jFinalizer can combine and compress all of your CSS and javascript files. In addition, it can minimize your HTML output. In short, it can increase your Google Page Speed by more than 20 points. If you don’t have it, get it. It’s free and it works.
Joomla Cache – Joomla Cache can speed up your site by saving modules and pages as file so they don’t have to be built each time the page loads.
Turn on Joomla Cache. See the following url for more information about Joomla Cache: http://docs.joomla.org/Cache
How to Speed Up Your WordPress Website
W3 Total Cache by W3 EDGE ®, a website speed optimizer for WordPress is an excellent plugin. It can combine and compress all WordPress javascripts and CSS files, cache pages, cache pages, cache database, and minify HTML.
I noticed about a 12 point speed increase on my WordPress blog when I implemented it.