Your question is not yet complete and Why do you want Performance Testing on the mobile app?
- Is this Hybrid or Native app?
- Platform: B2B (Not necessary to do performance testing. B2C)
- Which domain your app is? e-commerce, Healthcare?
- Target audience? what is the number of user on app or data hitting to your server?
If you are aware of all then you can think to do performance testing or not?
The simple and smart way is Compare your competitor app performance, consider it Benchmark if they are doing good