Academy / Advanced Level: HTML and CSS

Web Performance Optimization

Key Takeaways

• Minification and compression reduce the size of CSS, JavaScript, and HTML files, leading to faster downloads.
• Image optimization using the correct format, compression, and responsive loading improves site performance.
• Lazy loading and asynchronous loading ensure that non-essential resources don’t block the page’s initial rendering.
• Caching and CDNs reduce load times by storing and delivering assets from nearby servers.
• Web fonts can be optimized by limiting font weights and styles, using font-display: swap, and compressing with WOFF2.
• Reducing HTTP requests by combining assets and using CSS sprites decreases the time spent downloading resources.
• Tools like Chrome DevTools and Lighthouse provide valuable insights into performance bottlenecks and offer suggestions for improvement.
• JavaScript optimization through minification, deferring scripts, and using Web Workers ensures smooth and responsive experiences.
• Modern techniques like HTTP/2, WebP, and Server-Side Rendering (SSR) offer advanced ways to improve performance, especially for large or media-heavy websites.

---

👈 What’s Next?

• 🧪 Test Your Site’s Performance with Lighthouse
• ➕ Learn More About Server-Side Rendering and Progressive Web Apps (PWA)