make php applications run faster by using HHVM or hack language

 https://www.comentum.com/ruby-on-rails-vs-php-comparison.html

in this link he says hhvm is faster for php than zend engine work it is using currently

https://hhvm.com/https://hhvm.com/

https://www.quora.com/Why-isnt-Facebooks-hack-language-more-popular

hhvm difficult to host