requestAnimationFrame can't measure FPS in RN

[shamilovtim]

Hello, I stumbled on this repo from a mutual. I've instrumented FPS in RN before so I was immediately curious what your implementation would look like. I noticed FPS is probably not instrumented correctly. I instrumented FPS on the native side for both Android and iOS. FPS is opaque to the RN runtime so to my knowledge you can't measure it from inside of react / javascript. See the relevant discussion here. If you try a native implementation you should be able to do it.

[adnxy]

I am aware that the only 100% accurate way to measure FPS is using native modules. I tried achieving this as close as possible with only JS implementation. I would love to move this into native module in the upcoming versions and FPS is on top of my list.