Performance

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1. 1 Explain the Core Web Vitals: LCP, INP (replacing FID), and CLS — what do they measure and how do you improve each? Medium
2. 2 What is code splitting and how does dynamic `import()` combined with a bundler reduce initial bundle size? Medium
3. 3 Explain debouncing and throttling as performance techniques for scroll/resize/input event handlers. Medium
4. 4 How would you profile a janky animation using Chrome DevTools' Performance panel to find the bottleneck? Hard
5. 5 Explain virtualization/windowing (e.g., react-window) for rendering large lists performantly. Hard
6. 6 What is tree-shaking and how do ES Modules and bundler configuration affect how much dead code gets eliminated? Medium
7. 7 Explain memoization at the component level (e.g., `React.memo`, `useMemo`) versus function-level memoization. Medium
8. 8 How do you measure and reduce Time to Interactive (TTI) and Total Blocking Time (TBT) on a JS-heavy page? Hard