While testing a new mobile application we were tasked to analyse performance.
We already did some load testing at the backend.   

However, now we would like to see which API calls take the longest to process on our actual device. Are there any tools that allows us to analyse this?   

I checked out APM such as NewRelic and Crittercism which would be a great fit for our process. The thing is, we only want to use this in our QA environment.  

Basically is there anything like NewRelic for only a couple different users?

EDIT: This is a native application.