If you want the honest starting point, here it is: React Native performance optimization after migrating to the new architecture usually means identifying which layer actually changed the behavior of your app. Some teams upgrade to the React Native New Architecture expecting automatic speed improvements. In reality, the shift to Fabric Renderer, TurboModules, JavaScript Interface (JSI), and the Hermes JavaScript Engine changes how JavaScript, native code, and UI rendering interact. If those pieces are not tuned correctly, the app can still feel slow, stutter, or consume more memory than expected. That is why React Native performance optimization should begin with understanding the architecture itself. The performance characteristics of the legacy React Native bridge are not the same as the ones introduced by JSI and Fabric. Once the architecture changes, the performance tuning strategy also changes.…