WordPress 4.1 is actually 0.79 percent SLOWER on PHP 7 than it is on HHVM. That said, PHP 7 running WordPress 4.1 is still 96.34 percent FASTER than using PHP 5.6
https://docs.google.com/presentation/d/1TwpPEnXd_FAeAFke_t9uSMjJMDwDct3bDwQhD_JVjVQ/edit?usp=sharing
PHP7
