Your question is Optimizing Slow Python Record Processing. 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).
How would you optimize a Python script that is running too slowly on a dataset of one million patient records? Walk through how you would profile it, identify bottlenecks, and improve both runtime and memory usage.