It's less that it's bad (in my opinion) and more that on Android you have a much wider range of hardware to support ranging from quite new and recent, to basically ancient almost flip phone level.

I am hoping that in the future something like React Fiber (https://www.youtube.com/watch?v=aV1271hd9ew) will make its way to React Native and unlock a new level of performance.

It's also limited by the single-core performance in Android phones, which IIRC is far behind Apple's chips.