A Joomla-based website could generate pages with less speed than an HTML one. That’s because the pages are created on-the-fly when a user generates the request. That means executing the PHP engine, all the functions called by that PHP page, connecting to the database, executing all the queries and composing the HTML page that will be returned to the user’s browser.
Usually the creation of a Joomla page needs the execution of multiple queries on the DBMS.
The time needed to execute these tasks will increase exponentially when the server has a high traffic.
To increase the performance it’s advisable to enable the Joomla cache and the Gzip compression, via the Global Configuration panel in the administration backend.
The GZip compression leads to a faster download of the web page, that gets compressed by the server and then decompressed by the web browser.
You can also use the JRE Cache, a commercial plugin.
