.. _profiling-applications:

`Blackfire`_ is the best tool to profile and optimize performance of Symfony

applications during development, test and production. It's a commercial service,

but provides free features that you can use to find bottlenecks in your projects.

Symfony provides a basic performance profiler in the development

:ref:`config environment <configuration-environments>`. Click on the "time panel"

of the :ref:`web debug toolbar <web-debug-toolbar>` to see how much time Symfony

spent on tasks such as making database queries and rendering templates.

You can measure the execution time and memory consumption of your own code and

display the result in the Symfony profiler thanks to the `Stopwatch component`_.