Introducing the React Profiler (reactjs.org)
Sep 10, 2018
React 16.5 adds support for a new DevTools profiler plugin. This plugin uses React’s experimental Profiler API to collect timing information about each component that’s rendered in order to identify performance bottlenecks in React applications. It will be fully compatible with our upcoming time slicing and suspense features.
React v16.3.0: New lifecycles and context API (reactjs.org)
Mar 29, 2018
In React 16.3.0, we are adding a few new lifecycle methods to assist with that migration. We are also introducing new APIs for long requested features: an official context API, a ref forwarding API, and an ergonomic ref API.
Update on Async Rendering (reactjs.org)
Mar 27, 2018
We’d like to share with you some of the lessons we’ve learned while working on these features, and some recipes to help prepare your components for async rendering when it launches.