Your question is Testing for Reliability and Performance. 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).
Tell me how you would test an application to ensure reliability and performance.
Describe a practical test strategy, including test levels, failure conditions, performance measurements, and how you would use results to prevent regressions. You may use Apple tooling where relevant, but keep the answer applicable to a full stack application.