Mentioned Symfony performance article (#2442)

* Mentioned Symfony performance article in the doc

* Applied suggestion

Co-authored-by: Adrien Dupuis <[email protected]>

---------

Co-authored-by: Adrien Dupuis <[email protected]>

Author: mnocon

docs/infrastructure_and_maintenance/performance.md

@@ -52,6 +52,10 @@ In production setups:
 - Always enable opcache for php-fpm/`mod_php`.
 - Prefer php-fpm and web server using it over fast-cgi for lower overall memory usage.
 
+### Symfony
+
+- Review the [Symfony performance documentation]([[= symfony_doc =]]/performance.html) and apply matching suggestions, including OPCache configuration if enabled.
+
 ### Composer
 
 - Keep Composer up to date.