Symfony 4 is painfully slow in DEV

Question

I try to run a simple Symfony 4 project on a docker container. I have tested regular PHP scripts, and they work very well. But, with Symfony project, the execution gets ridiculously slow. For example, a page without any significant content takes 5-6 seconds.

I have attached the screenshots from Symfony's performance profiler.

Do you have any idea what how to reduce this execution time to an acceptable level?

Answer 1

It seems that changing the consistency level greatly increases Symfony performance. (see Docker docs)

Here is my new docker-compose.yml file. Note the ":cached" after the volumne.

version: '3'
services:
  web:
    image: apache-php7
    ports:
     - "80:80"
    volumes:
      - .:/app:cached
    tty: true

Note from manual:

For directories mounted with cached, the host’s view of the file system is authoritative; writes performed by containers are immediately visible to the host, but there may be a delay before writes performed on the host are visible within containers.