PHP 5.7 gets refactored core, is 10%-30% faster than PHP 5.5! Wow!
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What an announcement! The awesome PHP core guys have refactored the Zend Engine (which drives PHP) and could successfully speed up real world applications dramatically with this: WordPress get 20% more performance, Drupal 11%, a Zend Framework test application even 30% more speed. Wow, excellent job!
More info here on the PHPNG (“New Generation”) page (which seems to be the cleaned up PHP branch for 5.7) and for supernerds a quite deep insight into the exact refactorings inside the Zend Engine here.