Your question is Diagnose Mobile App Performance Bottlenecks. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How do you diagnose and optimize mobile app performance? Walk me through the signals you look for, the tools or profiling data you use, and how you decide whether the bottleneck is CPU, memory, rendering, network, or concurrency-related.