I don't have any performance issues with React Native[0], so as far as I'm aware the status quo is fine with regards to how well the hardware is optimized for the SDK. The specific SDK I'm referring to is JSCore, obviously everything on top of that is third-party.

[0] My main beef with React Native is the total lack of useful stack traces. Also, when running on a device, when you tap Debug before manually setting your dev machine's IP, the app is bricked and you have to delete and reinstall it.