Web Performance

What Is Web Performance?

Slow websites don’t just lose rankings — they lose customers: studies show that every additional second of load time reduces conversion rates by up to 7%. Web performance should therefore not be a one-time project but a continuous process with regular monitoring. Start with the biggest bottlenecks — image compression, caching, and a CDN often deliver significant improvements right away.

Web performance is the totality of all load time and rendering metrics of a website. It encompasses not just classic page speed but also INP (interactivity), CLS (visual stability), server-side response times, and the efficiency of JavaScript and CSS file loading. Web performance is critical not only for SEO but also for conversion rates and user satisfaction.

Technically, web performance consists of several layers: server performance (TTFB — Time to First Byte), rendering performance (how quickly the browser can render the page), JavaScript execution, and resource optimization (image compression, Lazy Loading). Modern web performance also requires an understanding of caching strategies, CDN usage, and code splitting. Tools like Google PageSpeed Insights, Lighthouse, and WebPageTest show where the bottlenecks lie.

In practice, web performance should be a continuous process, not a one-time optimization. Start with a baseline measurement over several weeks. Then identify the biggest problems: is the server slow (TTFB)? Is JavaScript unoptimized? Are images too large? Fix the big problems first. Use caching headers, compression, and a CDN. Monitor continuously with real-user metrics from the Search Console — not just with synthetic lab data.