About WebVitalsDev

A publication for people responsible for a website

WebVitalsDev is an independent technical publication about Core Web Vitals, page speed, server performance and technical SEO. It serves website owners, developers, agencies, publishers and commerce teams who need to understand a problem and decide what to do next.

The focus is practical explanation. A score is useful only when you know what it measures, which visitors it represents and what implementation could change the outcome. Our guides connect those questions to the browser, server and platform behavior behind them.

What you will find here

Coverage includes LCP, INP and CLS; PageSpeed Insights and Lighthouse; images, fonts, CSS and JavaScript; caching and content delivery; and the technical foundations of crawling and indexing. Platform guides apply those principles to WordPress, WooCommerce, Shopify, Next.js and React.

The free tools help interpret measured values, organize checks and estimate image-transfer savings. The live PageSpeed analyzer, when enabled, requests an external analysis. Each tool explains its inputs and limits.

How the content is prepared

Technical claims are checked against official documentation and relevant specifications. Examples are identified as examples; they are not presented as measurements from invented client projects. Version-dependent guidance is described with its context, and uncertainty stays beside the claim it qualifies.

WebVitalsDev publishes in English, Spanish, German, French, Korean and Hebrew. Localized editions preserve the technical meaning while using natural terminology for their readers.

Questions and corrections

Read the editorial policy and corrections policy for the standards behind the publication. For a factual correction, tool issue or other question, contact [email protected] with the relevant page and a clear explanation.