According to this article:
Debugging React performance with React 16 and Chrome Devtools.
I want to inspect some performance things of my own website built by React as well. But I cannot see the User timing section in my DevTools. Chrome version with 62.0.3202.89 in my computer, am I missing something?
I was able to make this work by appending ?react_perf
to my url. Not sure why this was so difficult to find... hope it works for you.
https://reactjs.org/blog/2016/11/16/react-v15.4.0.html#profiling-components-with-chrome-timeline