Your question is Optimize Slow Web App. 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).
Describe a time you optimized a slow-loading web application that handled thousands of data points. Explain how you identified the primary bottleneck, prioritized improvements, coordinated implementation and validation, and measured the result. Address any trade-offs, risks, or rollout considerations involved.