Web Development Intermediate

What is Web Performance Optimization?

Techniques to make websites load faster and respond more quickly, improving user experience and search engine rankings.

Web performance optimization covers reducing page load time, time to interactive, and perceived performance. Key techniques include image optimization (WebP format, responsive images, lazy loading), CSS/JS minification and bundling, critical CSS inlining, code splitting, browser caching with proper Cache-Control headers, CDN usage, Gzip/Brotli compression, reducing DNS lookups, preconnect/preload hints, and server-side rendering. Core Web Vitals (LCP, FID/INP, CLS) are Google's performance metrics affecting SEO rankings. Tools like Lighthouse, PageSpeed Insights, and WebPageTest measure and recommend improvements. Every 100ms of latency can reduce conversion rates.

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Cross-Origin Resource Sharing (CORS)

An HTTP mechanism that allows web pages to request resources from a different domain than the one serving the page.

The latest HTTP version that uses QUIC instead of TCP, providing faster connections and better performance on unreliable networks.

SSR (Server-Side Rendering)

A technique where web pages are rendered on the server and sent as complete HTML to the browser, improving SEO and initial load time.

A widely-used server-side scripting language designed for web development that powers over 75% of websites including WordPress.

Storing copies of frequently accessed data in faster storage to reduce load times and server processing.

A mechanism where a server sends real-time HTTP POST notifications to a specified URL when specific events occur.

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