1. What is code splitting in Next.js?
Basic
Code splitting automatically splits JavaScript bundles by route. Reduces initial bundle size. Supports dynamic imports. Improves page load performance. Built into Next.js by default.
2. What is automatic static optimization?
Basic
Next.js automatically determines which pages can be statically generated. Improves page load performance. Supports hybrid static and dynamic pages. No configuration required.
3. What is font optimization?
Basic
Next.js automatically optimizes font loading. Reduces layout shift. Supports CSS size-adjust. Implements font display strategies.
4. How do you handle performance monitoring?
Moderate
Use Web Vitals API, implement analytics, track performance metrics. Support performance tracking. Implement monitoring strategies.
5. How do you implement performance monitoring tools?
Advanced
Create custom monitoring solutions, handle metric collection, implement analytics integration. Support monitoring strategies. Implement tool development.
6. How do you implement lazy loading?
Moderate
Use dynamic imports, React.lazy(), and Suspense. Handle component loading states. Support code splitting. Implement loading strategies.
7. How do you handle bundle analysis?
Moderate
Use @next/bundle-analyzer, analyze bundle size, identify large dependencies. Support code splitting analysis. Implement size optimization.
8. How do you handle resource prioritization?
Moderate
Implement resource hints, handle preload/prefetch, optimize loading order. Support priority strategies. Implement resource optimization.
9. How do you optimize HTTP/2?
Moderate
Configure server push, handle multiplexing, optimize request prioritization. Support HTTP/2 features. Implement protocol optimization.
10. How do you handle performance testing?
Moderate
Implement load testing, measure performance metrics, use Lighthouse scores. Support performance benchmarking. Implement testing strategies.
11. How do you optimize WebAssembly usage?
Advanced
Implement WebAssembly modules, handle integration, optimize performance. Support WASM strategies. Implement optimization techniques.
12. How do you optimize WebGL content?
Advanced
Handle 3D rendering optimization, implement WebGL best practices, optimize graphics performance. Support graphics optimization. Implement rendering strategies.
13. How do you handle performance documentation?
Advanced
Create performance guidelines, document optimization strategies, implement documentation updates. Support best practices. Implement documentation management.
14. How do you optimize build pipelines?
Advanced
Implement build optimization, handle CI/CD performance, optimize deployment process. Support pipeline strategies. Implement optimization techniques.
15. What are Core Web Vitals in Next.js?
Basic
Core Web Vitals are key metrics measuring user experience: LCP (Largest Contentful Paint), FID (First Input Delay), CLS (Cumulative Layout Shift). Next.js provides built-in optimizations for these metrics.
16. How does image optimization work?
Basic
Next.js Image component automatically optimizes images. Supports lazy loading, responsive sizes, modern formats. Reduces image file size. Improves loading performance.
17. What is script optimization?
Basic
Next.js Script component optimizes third-party script loading. Supports loading strategies (defer, lazy). Prevents render blocking. Improves page performance.
18. How does route prefetching work?
Basic
Next.js automatically prefetches links in viewport. Reduces page load time. Supports custom prefetch behavior. Uses intersection observer API.
19. How does caching work in Next.js?
Basic
Next.js supports multiple caching strategies: build-time cache, server-side cache, client-side cache. Improves response times. Supports cache invalidation.
20. How do you optimize rendering?
Moderate
Implement memo, useMemo, useCallback hooks. Handle component optimization. Support render optimization. Implement rendering strategies.
21. How do you handle memory optimization?
Advanced
Implement memory management, handle memory leaks, optimize resource usage. Support memory monitoring. Implement optimization strategies.
22. How do you optimize CSS delivery?
Moderate
Use CSS Modules, implement critical CSS, handle CSS-in-JS optimization. Support style optimization. Implement CSS strategies.
23. How do you implement CDN optimization?
Moderate
Configure CDN caching, handle asset distribution, optimize edge caching. Support CDN strategies. Implement delivery optimization.
24. How do you optimize for mobile?
Advanced
Implement mobile-first optimization, handle responsive optimization, optimize touch interactions. Support mobile strategies. Implement device optimization.
25. How do you handle performance budgets?
Advanced
Set performance targets, monitor metrics, implement budget tracking. Support performance goals. Implement budget strategies.
26. How do you implement service workers?
Advanced
Configure service workers, handle offline support, implement caching strategies. Support PWA features. Implement worker optimization.
