Welcome to your interview.
The question is on your right: Optimizing Web App Performance. 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.
What strategies would you use to optimize a web application for performance? Walk through how you would identify bottlenecks, improve frontend and backend execution, and verify that your changes actually helped.