Performance

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1. 01 Explain route-based vs component-based code splitting. Medium
2. 02 Design a bundle-splitting strategy for a large app to keep the initial JS payload under 150KB. Hard
3. 03 Explain lazy loading for components, images, and routes. Medium
4. 04 Design a lazy-loading strategy for a below-the-fold, image-heavy product gallery. Hard
5. 05 Explain how tree shaking works and what prevents it (e.g., side effects, CommonJS). Medium
6. 06 Debug a bundle where tree shaking isn't eliminating unused exports from a third-party library. Hard
7. 07 Explain list virtualization and how libraries like react-window implement it. Medium
8. 08 Design a virtualized grid for a spreadsheet-like UI with both row and column virtualization. Hard
9. 09 Explain responsive images using srcset and sizes. Medium
10. 10 Design an image-loading strategy for a Pinterest-style masonry grid balancing LCP and bandwidth. Hard
11. 11 Explain font-display strategies and their impact on CLS and FOIT/FOUT. Medium
12. 12 Design a web font loading strategy for a page using three custom font weights. Hard
13. 13 Explain how a CDN reduces latency and improves TTFB. Medium
14. 14 Design a CDN caching strategy for a mix of static assets and personalized API responses. Hard
15. 15 Explain the tradeoffs between compression ratio and CPU cost for text assets. Medium
16. 16 Design a compression strategy for a server serving both static assets and dynamic JSON APIs. Hard
17. 17 Explain HTTP/2 multiplexing and how it changes bundling strategy compared to HTTP/1.1. Medium
18. 18 Should you still bundle aggressively under HTTP/2? Justify your answer. Hard
19. 19 Explain how HTTP/3 and QUIC improve on HTTP/2, particularly around head-of-line blocking. Medium
20. 20 What migration considerations exist when adopting HTTP/3 for a global user base? Hard
21. 21 Explain how Brotli compression compares to Gzip in ratio and compatibility. Medium
22. 22 When would you choose Brotli over Gzip, and what's your fallback strategy for unsupported clients? Hard
23. 23 Explain how Gzip compression works at a high level. Medium
24. 24 Debug a server misconfiguration where Gzip isn't being applied to JS/CSS responses. Hard