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Facebook releases HipHop for PHP

Facebook releases HipHop for PHP which has reduced their CPU usage by 50%.

HipHop for PHP isnt technically a compiler itself. Rather it is a source code transformer. HipHop programmatically transforms your PHP source code into highly optimized C++ and then uses g++ to compile it. HipHop executes the source code in a semantically equivalent manner and sacrifices some rarely used features — such as eval — in exchange for improved performance. HipHop includes a code transformer, a reimplementation of PHPs runtime system, and a rewrite of many common PHP Extensions to take advantage of these performance optimizations.

via Facebook Developers | HipHop for PHP: Move Fast.