From the Joomla blog today there's a new post looking at a few things that you can do to help speed up your site's Joomla installation - simple things that can make a lot of difference.

I'm going to outline some basic rudimentary steps that you can take to optimize your sites performance, and I'd like to hear any other suggestions that you may have ... here's the kicker though, steps users can take WITHOUT making addons to Joomla [...] I also think the majority of Joomla users are running Joomla in a shared hosting environment, so talking about too many server side optimisations could also overwhelm them with steps they are unable to take anyway.

Their suggestions involve enabling caching, keeping up with the latest version, checking on the PHP versions your hosting company is running (or you are) and optimizing some of the contents of the site like images, javascript or CSS. Check out the comments for other suggestions from other Joomla users.