This article focuses on techniques that can make React perform better as a whole and not on particular timings. For actual timings, a simple google search yielded the following results for the application of the patterns mentioned in my article:
You can also benchmark your own code by implementing some of the tips mentioned above and measuring the rendering time through the React Profiler: https://reactjs.org/blog/2018/09/10/introducing-the-react-profiler.html .
Unfortunately, React apps vary so much that it would be really hard to create a proper benchmark. If you can find me a React app that’s objectively accepted as a suitable benchmarking candidate, I’d be happy to apply these techniques and add numbers to this article :)