I put a docker develop with NET in rootless.
The site works well, but it is very slow both to display an image and to make a query on the database.
In root mode on another server.

I do not know if the problem comes from the rootless or the configuration of the server.

When I do docker info in non-root I saw these errors:

WARNING: No cpuset support
WARNING: No io.weight support
WARNING: No io.weight (per device) support
WARNING: No io.max (rbps) support
WARNING: No io.max (wbps) support
WARNING: No io.max (riops) support
WARNING: No io.max (wiops) support
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled