Merge branch '5.0'

* 5.0:
  Removed the versionadded directive
  Mentioned the PHP 7.4 class preloading
  Scalingo is another PaaS which supports Symfony

Author: javiereguiluz

deployment.rst

@@ -72,6 +72,7 @@ app quickly. There are many PaaS - below are a few that work well with Symfony:
 * `Azure`_
 * `fortrabbit`_
 * `Clever Cloud`_
+* `Scalingo`_
 
 Using Build Scripts and other Tools
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -254,3 +255,4 @@ Learn More
 .. _`EasyDeployBundle`: https://github.com/EasyCorp/easy-deploy-bundle
 .. _`Clever Cloud`: https://www.clever-cloud.com/doc/php/tutorial-symfony/
 .. _`Symfony Cloud`: https://symfony.com/doc/master/cloud/intro.html
+.. _`Scalingo`: https://doc.scalingo.com/languages/php/symfony

performance.rst

@@ -17,6 +17,7 @@ Production Server Checklist
 ---------------------------
 
 #. :ref:`Use the OPcache byte code cache <performance-use-opcache>`
+#. :ref:`Use the OPcache class preloading <performance-use-preloading>`
 #. :ref:`Configure OPcache for maximum performance <performance-configure-opcache>`
 #. :ref:`Don't check PHP files timestamps <performance-dont-check-timestamps>`
 #. :ref:`Configure the PHP realpath Cache <performance-configure-realpath-cache>`
@@ -42,6 +43,24 @@ every request. There are some `byte code caches`_ available, but as of PHP
 5.5, PHP comes with `OPcache`_ built-in. For older versions, the most widely
 used byte code cache is `APC`_.
 
+.. _performance-use-preloading:
+
+Use the OPcache class preloading
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Starting from PHP 7.4, OPcache can compile and load classes at start-up and
+make them available to all requests until the server is restarted, improving
+performance significantly.
+
+Symfony generates the file automatically with the list of classes to preload.
+The file path is the same as the file generated for the service container but
+with the ``preload`` suffix:
+
+.. code-block:: ini
+
+    ; php.ini
+    opcache.preload=/path/to/project/var/cache/prod/App_KernelProdContainer.preload.php
+
 .. _performance-configure-opcache:
 
 Configure OPcache for Maximum Performance