Site Speed Optimization: A Practical Guide

Site speed is today a cornerstone of both user experience and SEO. Research shows that every second of load time significantly lowers conversion rate. This guide collects the most effective ways to speed up your site.

Measure first: Core Web Vitals

Before optimizing, measure the current state. Google's Core Web Vitals define your roadmap:

• LCP — time to load the largest content
• INP — responsiveness to user interaction
• CLS — stability against visual shifts

Optimize images

Images are usually the heaviest part of a page. Modern formats (WebP/AVIF), correct sizing, compression and lazy-loading off-screen images deliver big gains.

Reduce code and requests

Remove unnecessary JavaScript and CSS, defer non-critical code, minify and combine files. Fewer, lighter requests mean a faster page.

Caching, CDN and server

Browser caching, a content delivery network (CDN) and a fast server infrastructure deliver content to the user as close and as quickly as possible. Server response time (TTFB) is often an overlooked but critical factor.

Summary: speed optimization is not a one-time task but an ongoing discipline. Measure first, start with the heaviest bottleneck and track the impact of changes. A fast site means better rankings and more conversions.

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