Frontend Performance and Optimization Questions

Evaluate the ability to identify, measure, and remediate performance bottlenecks across components and at application scale. Candidates should discuss how to measure performance with browser tooling, avoid unnecessary reflows and repaints, prevent memory leaks, and reduce wasted work through memoization and controlled rendering. They should be able to explain code splitting and lazy loading strategies, image and asset optimization, caching policies and use of content distribution networks, trade offs between infinite scroll and pagination, and perceived performance techniques such as skeleton screens and progressive loading. Decision making should include cost, maintainability, and user experience trade offs.