It doesn't look like this gives more information than the built in profiling tools[0] React already has.
So it looks like an interesting project to learn the component lifecycle and some React internals, but if you need to make your react apps faster you should probably use the provided profiling tools.
The current debugging tools use the User Timing API, which according to the post have large overhead, and don’t account for ‘yield’ time when async rendering is enabled (this is kind of the TL;dr for the whole proposal).
So it looks like an interesting project to learn the component lifecycle and some React internals, but if you need to make your react apps faster you should probably use the provided profiling tools.
[0] https://building.calibreapp.com/debugging-react-performance-...