....I think it will depend on the number of users with active connections (which I don't know how to measure). My current numbers are (in GB's):
That is about 5% of my server capacity, and CPU is broadly in the 5% arena, with misago roughly consuming 10-20 times more than the other three components.
That doesn't include postgresql usage, the reverse proxy (caddy 2), and authorisation and identity backend (authelia backed with ldap), all of which are independent system wide services that have some resource consumption attributable to misago.
Clearly my podman setup is not a direct correlation to your docker-compose automated install.