How to properly speed up the server?

Question

CentOS

I bought vps on centos 6. I want to install components that would speed up sites on it. What is the most efficient way to do this?

Answer 1

Let me rephrase your question: I got sick. I want to take medicine that would cure me. What is the most efficient way to do this?
To answer it, you need to fully know what you mean by the concept of "site speed", the nature of the load, the characteristics of the hardware and the requirements for the sites themselves.

Answer 2

nginx, xcache, etc. from the general