How to Speed Up Your Joomla Website
jFinalizer for Joomla is an excellent Joomla Website Optimization tool.
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
I noticed about a 12 point speed increase on my WordPress blog when I implemented it.