Joomla corporate site imprevements

One of our clients has an existing website ([login to view URL]) which is built using Joomla CMS and the ja_purity template. We would like a few changes carried out as follows; Optimise joomla configuration ----------------------------- The site is running quite slowly; we would like to turn off modules that are not needed. Other simple suggestions around how we can improve performance are welcome. Vertical Menu ------------- We already have a second level menu on the site however it would be good to extend this in order to support CSS rollovers. An example of this functionality can be seen here ([login to view URL]). Note that is just an example and NOT how we want it to look. It will need to be styled to match the site. Secure Area ----------- Add a Secure section to the site which can only be accessed with a username and password. Client needs the ability to upload files to the secure section. Users can then log in and download files.