It is believed that the Symfony framework is quite heavy and it can be difficult to develop a website that will be able to work under the high load.
It is true, but does this mean that it is impossible to implement a dynamic caching and to update only a small part of entire page as data is updated?
This talk will give your an answer to that.
It is Varnish, ESI-blocks and load balancing. With hundreds of thousands of unique visitors and million hits a day, we continue to use Symfony, and do not see any problems.