Query processing (especially dynamic), for example, such a web server like Apache can be quite demanding on system resources process. Therefore, it is not by chance that the most popular lightweight web servers - nginx and lighttpd, which can operate independently or in conjunction with Apache as a front-end for static queries.

Varnish allows you to significantly relieve the Web servers and to reduce the overall response time.

Varnsih is a free solution for caching both static and dynamic content. He works as a front-end to any Web server or application server and initially focused on high performance, multi-threading, and the most efficient use of the OS family of Linux. In addition, there is nothing surprising in the fact that it is widely used by companies such as Facebook, Twitter and LinkedIn.

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