Why such a slow download speed in Nextcloud?

Question

ownCloud/Nextcloud

In general, openmediaserver, a portainer is screwed on it, I installed nextcloud through it, set up a reverse proxy in nginx, everything works, noooo ....
The connection between the host and devices on the local network is 1Gbps, and the download from the server corresponds to this, but here the download to the server is about 200 Mbps, but, for example, if you put seafiles, also a container, then the download speed to the server is about 700 Mbps, how can I fix this?