Beta13 is much more performant on my very simple Symfony example (a default Symfony install) too. Running this:
ab -n 100 -r 127.0.0.1:8080
takes 26.9 seconds instead of 210 seconds! (I’m using a late-2013 Macbook Pro)
I published more detailed results here: https://github.com/michaelperrin/docker-symfony-test/blob/master/README.md#results
It’s still quite slow but it’s already a huge step forward.