Web Performance Metrics and Measurement Questions

Understanding of how to measure, interpret, and act upon web performance data. Topics include Core Web Vitals such as First Contentful Paint, Largest Contentful Paint, and Cumulative Layout Shift, Time to First Byte, synthetic and real user monitoring, using tools such as Lighthouse, Chrome DevTools, and WebPageTest, establishing performance budgets, instrumentation and logging for real user metrics, benchmarking changes, and prioritizing optimizations based on user impact. Candidates should be able to design measurement strategies, run before and after comparisons, and integrate performance checks into development workflows.