When I first start the React Native Playground app on Android with a 4x4x4 grid of rotating boxes, the FPS is about 26. If I toggle the engine view (which does a reset in the native layer), the frame rate doubles. The same thing happens if I just lock and unlock the phone. I also noticed that the spheres are rotating at double speed before I toggle the engine view, so it seems to me like it's basically doing the update loop twice per frame initially. This only happens in release builds (not debug).