Dokku itself doesn't run anything in resident (there is a small go binary that listens to the docker event stream and restarts apps as necessary but thats it), so there shouldn't be overhead there.

On the Docker side, there is a _slight_ amount of overhead in cpu/networking, but its so negligible that its sometimes difficult to benchmark. While I can't really make changes to Docker to alleviate issues, I'd be interested in knowing what parts of Docker are heavyweight so we can better surface any such information to Dokku users.