React Native Profiler

App.js

import React, {Component} from "react"
import {Text, View} from "react-native"

const Profiler = React.unstable_Profiler

export default class App extends Component {
  logMeasurement = async (id, phase, actualDuration, baseDuration) => {
    // see output during DEV
    if (__DEV__) console.log({id, phase, actualDuration, baseDuration})
  }

  render() {
    return (
      <Profiler id={"HomeScreen"} onRender={this.logMeasurement}>
        <View>
          <Text>Welcome to React Native!</Text>
        </View>
      </Profiler>
    )
  }
}