Joomla : Improve Site Performance
1) Enable Joomla Site Caching
Open the Joomla Administrator, select the Site menu, then Global Configuration, then System. I’ve configured caching with a 15 minute cache life.
For sites with data which changes infrequently, use a higher time.
2) Enable Apache PHP/HTML compression
Edit the .htaccess file in the root of your Joomla Website, modify the IfModule mod_php4.c section to include the line ‘php_flag zlib.output_compression on’ – for example:
php_value max_execution_time 120
php_flag zlib.output_compression on