This tutorial will review the process of enabling caching on your Drupal website. If speed is what you are looking for, this is a good way of achieving your goal.
To enable caching, you need to log into your website as administrator and click on the Configuration tab from the main menu.
Locate the Development section and then Performance
Edit the following options:
To clear the cache, you will have to access the cache manager again and then click on the Clear all caches button.