In the previous recipe, you learned how to connect with minifying CSS and JS files and reduce the number of requests to the Liferay Portal. The next step in our configuration is reducing requests to the application server where Liferay is. The idea is that some static resources can be served by Apache server or, better, by Squid cache. Delivering static resources through the Apache server or Squid cache instead of the application server improves the response time.
Liferay supports CDN. Wikipedia defines this term as follows:
"A content delivery network or content distribution network (CDN) is a large distributed system of servers deployed in multiple data centers across the Internet. The goal of a CDN is to serve content to end-users with high availability and high performance."