Welcome to your interview.
The question is on your right: Mobile App Performance Optimization. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
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.