I frankly don't see where containers could lower the performance.
Basically a container is a glorified chroot. It has the same networking unless you asked for isolation, then packets have to follow a local (inside the host) route. It has exactly no CPU or kernel interface penalty.
Maybe you wanted to say about container orchestration like k8s, with its custom network fabric, etc.
> I frankly don't see where containers could lower the performance.
Have you seen most k8s deployments? It's not the containers, it's the thoughtspace that comes with them. Even just using bare containers invites a level of abstraction and generally comes with a type of developer that just isn't desirable.
Basically a container is a glorified chroot. It has the same networking unless you asked for isolation, then packets have to follow a local (inside the host) route. It has exactly no CPU or kernel interface penalty.
Maybe you wanted to say about container orchestration like k8s, with its custom network fabric, etc.