After two days of research and struggle to understand the principle of temporary provisional Facebook and google guy why it runs so fast ... It has thousands of servers located around the neck on the hour and has a large fixed sever a place to run the remaining resource cache running in each country. If any country ip access the cache on the server it will save this country and then it just dragged it out the cache for other uses to signify a person. Mentioned as a post above. There will be instructions on how to use memcached to sever + vbb slightly. Link : http://www.congnghemoigialai.vn/thiet-ke-website-gia-re-gia-lai/thu-thuat-seo---danh-cho-webmaster/huong-dan-cai-dat-memcache-cho-vbb.html