The Symfony Finland has shared some benchmarks of the latest versions of the Symfony framework (simple applications) on three current environments to see the differences: PHP 5.6, HHVM 3.11 and PHP 7.0.1.
Since the first functional versions of PHP 7.0.0 were made available, there have been a number of benchmarks comparing PHP 5.6, HHVM and PHP 7. [...] The recently released eZ Platform is a CMS built on the Symfony framework. It's a good representation of a modern PHP application with complex functionalities and no legacy code from the 2000's. Thus making a good candidate benchmarks for testing an application built with the Symfony Framework (version 2.7.8).
So let's see how an application built with the Symfony2 framework fares on PHP 5.6, HHVM 3.11 and PHP 7.0.1.
He starts by describing the test setup including the default installation of the eZ platform and how it was configured/set up. He then shares the results, showing memory usage and response times for each of the three different platforms. There's even results from different parts of the application: the front page and the "Top Stories" and "Projects" pages. The results also include the findings for the number of requests per second both with and without the Symfony Proxy included in the platform.