HHVM or Hip Hop Virtual Machine has been ported over to the WordPress development crowd down to the core. HHVM was originally developed by Facebook as a way to curb expenses of more hardware for improved speed and reliability of server side php execution though a process know as JIT or Just In Time.
Through Varying Vagrant Vagrants or VVV, HMVM is ported into an Apache web development environment which allows for near production environment on WordPress functionality down to the core. VVV is a replacement sandbox for MAMP/XAMPP development tools and environments. Continue reading HHVM: Speed in WordPress Development