Finding React Components to Optimize

Kyle Robertson
Nov 29, 2017 · 5 min read
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Tools to Debug Performance


if (process.env.NODE_ENV === 'development' && window) {
window.Perf = require('react-addons-perf');
> Perf.start()… (perform some state-changing user actions in the browser)> Perf.stop()


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Example output of the printWasted method. The third column shows the amount of wasted time spent rendering components that were ultimately discarded by React’s reconciliation process. The fourth and fifth columns show the number of instances of a component on the page and the number of times that component rendered, respectively.


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Partial output of printOperations, from the same segment of profile data that was used to generate the printWasted table above.

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