Your question is Mobile App Performance Optimization. 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).
Explain how you would optimize a mobile app that feels slow in common user flows. Describe how you would identify bottlenecks, what code patterns you would inspect first, and how you would decide which fixes to ship first.