Note: As of React 16, react-addons-perf is not supported. Please use your browser’s profiling tools to get insight into which components re-render. Importing import Perf from 'react-addons-perf'; // ES6 var Perf = require('react-addons-perf'); // ES5 with npm Overview React is usually quite fast out of the box. However, in situations where you need to squeeze every ounce of performance out of your