HHVM Alternative to PHP, said to increase speed by up to 40%. Â Works similar to java in that it pre-compiles PHP automatically to speed up execution time. Â Used by facebook. cd /etc/yum.repos.d wget http://www.hop5.in/yum/el6/hop5.repo echo ‘priority=9’ >> hop5.repo echo ‘includepkgs=glog,tbb’ >> hop5.repo wget http://yum.sexydev.com/sexydev-amazon.repo yum install hhvm