Translations:HHVM/13/en

It is a well-studied phenomenon that even small delays in response time (e.g. half of a second) can result in sharp declines in web user retention. As a result, popular websites such as Google and Facebook invest heavily in site performance initiatives, and partially as a result, remain popular. Formerly popular sites (such as Friendster) suffered due to lack of attention to these issues. Wikipedia and its sister projects must remain usable and responsive in order for the movement to sustain its mission.