Running docker containers causing slow network connection on the host

I have a problem with a network connection speed on host while running docker containers. I have a redmine service on the host (not dockerized). When I start any docker container on the host redmine becomes very slow. I’ve checked that resources (cpu, memory, disk i/o) on host are used only in a small part.

Docker version 18.06.1-ce, build e68fc7a
host OS: CentOS Linux release 7.5.1804 (Core)