Performance Optimization Interview Questions

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.

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.

Next.js Image component automatically optimizes images. Supports lazy loading, responsive sizes, modern formats. Reduces image file size. Improves loading performance.

Next.js automatically determines which pages can be statically generated. Improves page load performance. Supports hybrid static and dynamic pages. No configuration required.

Next.js Script component optimizes third-party script loading. Supports loading strategies (defer, lazy). Prevents render blocking. Improves page performance.

Next.js automatically prefetches links in viewport. Reduces page load time. Supports custom prefetch behavior. Uses intersection observer API.

Next.js automatically optimizes font loading. Reduces layout shift. Supports CSS size-adjust. Implements font display strategies.

Next.js supports multiple caching strategies: build-time cache, server-side cache, client-side cache. Improves response times. Supports cache invalidation.

Use dynamic imports, React.lazy(), and Suspense. Handle component loading states. Support code splitting. Implement loading strategies.

Use @next/bundle-analyzer, analyze bundle size, identify large dependencies. Support code splitting analysis. Implement size optimization.

Implement memo, useMemo, useCallback hooks. Handle component optimization. Support render optimization. Implement rendering strategies.

Use Web Vitals API, implement analytics, track performance metrics. Support performance tracking. Implement monitoring strategies.

Use CSS Modules, implement critical CSS, handle CSS-in-JS optimization. Support style optimization. Implement CSS strategies.

Implement resource hints, handle preload/prefetch, optimize loading order. Support priority strategies. Implement resource optimization.

Configure server push, handle multiplexing, optimize request prioritization. Support HTTP/2 features. Implement protocol optimization.

Configure CDN caching, handle asset distribution, optimize edge caching. Support CDN strategies. Implement delivery optimization.

Implement load testing, measure performance metrics, use Lighthouse scores. Support performance benchmarking. Implement testing strategies.

Implement mobile-first optimization, handle responsive optimization, optimize touch interactions. Support mobile strategies. Implement device optimization.

Set performance targets, monitor metrics, implement budget tracking. Support performance goals. Implement budget strategies.

Implement WebAssembly modules, handle integration, optimize performance. Support WASM strategies. Implement optimization techniques.

Configure service workers, handle offline support, implement caching strategies. Support PWA features. Implement worker optimization.

Implement memory management, handle memory leaks, optimize resource usage. Support memory monitoring. Implement optimization strategies.

Handle 3D rendering optimization, implement WebGL best practices, optimize graphics performance. Support graphics optimization. Implement rendering strategies.

Create custom monitoring solutions, handle metric collection, implement analytics integration. Support monitoring strategies. Implement tool development.

Create performance guidelines, document optimization strategies, implement documentation updates. Support best practices. Implement documentation management.

Implement build optimization, handle CI/CD performance, optimize deployment process. Support pipeline strategies. Implement optimization techniques.