React-native slow on android 5.1.1 but great for old 5.1

Question

We have developed a response application (v0.17.0) for iOS and Android. The iOS version is very sensitive to physical devices. On Android devices, I see a huge amount of volatility. In Android version 5.1, the application is super responsive. On two separate phones with 5.1.1 (and on both phones with much better features) it is very unresponsive. Navigation takes at least five seconds; TouchableHighlight buttons are sometimes not registered at all. Of course, I turned off dev mode, but the problem still persists. My problem is that I do not see any performance degradation on the emulator, and this makes fixing the problem difficult. Has anyone tested and fixed a similar issue? What would be an appropriate way to identify the problem?

Answer 1

Disabling dev mode should help the android, because it is very slow.

Answer 2

There is a little lack of information about what you use or use in your application. But I also had some performance issues in the application, and you could find reasons for them using sysTrace, which are mentioned in the following link.

https://facebook.imtqy.com/react-native/docs/android-ui-performance.html

You may be able to take advantage of this.