I think it's the time to add php-fpm to virtualmin!
There are several ways to serve PHP applications: mod_php, cgi, lighttpd fastcgi??. None of these solutions come close to PHP-FPM, a FastCGI Process Manager written by the nginx team that’s been bundled with PHP since 5.3. What makes PHP-FPM so awesome? Well, in addition to being rock-solid, it’s extremely tunable, provides real-time stats and logs slow requests so you can track and analyze slow portions of your codebase .
 Corona S., "Scaling PHP Applications", Leanpub, 2014, Page 5