A few friends and I have noticed that applications that are using React Native, even in the best of situations in optimizing, it still drains battery life faster (sometimes far faster) than something written in Java/Kotlin or ObjC/Swift.
Do you have any examples of that, and how do you determine which apps are built with RN? I've noticed a similar thing, but have nothing to go on but my gut instinct. For instance, I'm pretty sure that the food ordering app Ritual is using RN, it just doesn't feel quite native.
I'm a little late to reply. I use Discord and Slack a lot which uses RN but I've noticed that there are frame stutters when scrolling or when viewing gifs, and other chat applications like Telegram (native) do not have this problem. The stuttering is how I notice if they're using RN or not here.