Since its last update (the 2.2.0 version), Symfony has included a small piece of code of my own. To be precise, it is located in the "SensioFrameworkExtraBundle" bundle. It brings a new option to the DoctrineParamConverter object that allows to optimize the number of database requests when using the ParamConverter.
By the way, I have a new job, now I work for Efidev, french experts in agile software development and quality, and it's awesome! Second news, I've just migrated this website. I've left my VKS and now I have a dedicated server from kimsufi.