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Measure and improve performance

Below is a video of a React Native EU talk where we see how to

  • use Flashlight to measure the startup performance of a dummy app with lots of performance issues
  • use different analysis tools to debunk the issues and fix them:
    • React DevTools
    • JS Hermes Flame graph
    • Android Studio

The code of the app is available here.


The video uses an old version of Flashlight which required you to write a TS file. Now, you only have to run this command below 🥳:

flashlight test --bundleId com.reactnativefeed \
--testCommand "adb shell am start com.reactnativefeed/.MainActivity" \
--duration 15000