I did a good bit of research on the performance differences between different kinds of React components and back in February and submitted a PR to the React docs: https://github.com/reactjs/reactjs.org/pull/645. If you want to read it (note: no one on the React team has reviewed this yet, but I was careful to confirm my findings): you can do so here: https://deploy-preview-645--reactjs.netlify.com/docs/optimiz....

Unfortunately there is a long backlog of PRs to the React docs waiting for review so I don't know if/when this info might be incorporated into the docs. Also React is evolving so fast that it would need to be updated, e.g. to mention memo, and given that fast evolution I can understand why there's a backlog. But I do hope that someone on the React team eventually has time to look at adding more explanation to the "Optimizing Performance" section.