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Frontend Performance Checklist

Optimizing web performance involves multiple techniques working together.

This checklist provides a complete guide to ensure your website is fast, efficient, and user-friendly.

Use this as a reference before launching or auditing any web application.

Core Web Vitals

  • LCP ≤ 2.5s
  • INP ≤ 200ms
  • CLS ≤ 0.1

Continuously monitor and optimize these metrics.

Image Optimization

  • Use WebP/AVIF formats
  • Compress images
  • Serve responsive images
  • Lazy load below-the-fold images
  • Use image CDNs

CSS Optimization

  • Inline critical CSS
  • Remove unused CSS
  • Minify CSS
  • Avoid large frameworks if unnecessary

JavaScript Optimization

  • Minify and compress JS
  • Use code splitting
  • Defer non-critical scripts
  • Avoid long tasks
  • Reduce bundle size

Caching

  • Use browser caching
  • Set Cache-Control headers
  • Implement cache busting
  • Use service workers for offline caching

Network Optimization

  • Use HTTP/2 or HTTP/3
  • Enable compression (Gzip/Brotli)
  • Reduce number of requests
  • Use resource hints (preload, prefetch, preconnect)

CDN Usage

  • Serve static assets via CDN
  • Use edge caching
  • Optimize global delivery
  • Enable HTTPS and security features

Rendering Strategy

  • Choose CSR, SSR, or SSG wisely
  • Use hybrid rendering when needed
  • Optimize hydration
  • Reduce render-blocking resources

Font Optimization

  • Use modern font formats (WOFF2)
  • Preload important fonts
  • Limit number of font weights
  • Use font-display: swap

Third-Party Scripts

  • Audit third-party scripts
  • Load asynchronously
  • Remove unused integrations
  • Monitor performance impact

Testing & Monitoring

  • Use Lighthouse regularly
  • Monitor RUM data
  • Test on real devices
  • Track performance over time

Security & Performance

  • Use HTTPS
  • Enable HSTS
  • Optimize TLS handshake
  • Use secure CDNs

Real-World Workflow

  • Audit performance using Lighthouse
  • Fix critical issues (images, CSS, JS)
  • Implement caching and CDN
  • Optimize Core Web Vitals
  • Monitor with RUM
  • Continuously improve

Conclusion

Frontend performance is a combination of multiple optimization techniques.

Following this checklist ensures a fast, scalable, and user-friendly web application.

Performance optimization is an ongoing process that requires continuous monitoring and improvement.