Welcome to your interview.
The question is on your right: Keep Reports Fast on Live Data. 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.
How do you ensure your reports remain performant and load quickly when connected to large, live data sources?