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The Hip Hop Virtual Machine(HHVM) is a Just-In-Time(JIT) compiler that combines PHP and Hack(a PHP-like language)

HHVM was developed by Facebook to improve the load time of their web pages, which were written in PHP. HHVM can natively run most PHP code, as well as a new offshoot language called Hack.

HHVM makes its gains via a Just-In-Time compiler which seeks to reduce the bytecode (machine level instructions).

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