Drupal's core caching system allows to set minimum cache lifetimes. This means content will not be refreshed until after a certain time. For example, on busy sites, you would set the Minimum Cache Life to 1 hour. That means visitors do not see changes on your site more often than 1 hour. But it greatly helps to improve cache-efficiency and reduces your server load.
- Improved cache-efficiency
- Reduced server load
- Vistors see less frequent content changes