Enable the Joomla! cache
Enabling the cache will boost the overall performance of your installation. You can enable easily the caching system through the administrator panel of Joomla!.
Click the “System” and “Global Configuration” tabs:
Go to the “System” tab and check the “Cache Settings” configuration. Change cache setting to “ON - Conservative Caching”:
Activate the Cache Plugin. Go to “Extensions -> Plugin Manager” tab, search for “cache” and enable the “System - Cache” extension.