---
title: Understanding Core Web Vitals for Developers
description: A developer-focused guide to LCP, INP, and CLS — what causes them and how to fix them.
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# Understanding Core Web Vitals for Developers

[David Park](https://thedeveloper.javierfuentes.cl/blog/author/david-park)  Feb 3, 2025, 12:00:00 AM

Core Web Vitals are Google's user-experience metrics that directly affect search rankings. LCP measures loading performance, INP measures interactivity, and CLS measures visual stability. This post explains the root causes of poor scores and practical fixes for each metric.

[Best-Practices](https://thedeveloper.javierfuentes.cl/blog/tag/best-practices), [Performance](https://thedeveloper.javierfuentes.cl/blog/tag/performance), [SEO](https://thedeveloper.javierfuentes.cl/blog/tag/seo)

## Read On

[![](https://thedeveloper.javierfuentes.cl/hs-fs/hubfs/Imported_Blog_Media/photo-1507721999472-8ed4421c4af2-1.jpg?width=352&name=photo-1507721999472-8ed4421c4af2-1.jpg)](https://thedeveloper.javierfuentes.cl/blog/css-custom-properties-beyond-basic-variables)

### [CSS Custom Properties: Beyond Basic Variables](https://thedeveloper.javierfuentes.cl/blog/css-custom-properties-beyond-basic-variables)

 CSS custom properties are not just variables — they cascade, inherit, and can be updated at runtime...

[![](https://thedeveloper.javierfuentes.cl/hs-fs/hubfs/Imported_Blog_Media/photo-1504868584819-f8e8b4b6d7e3-1.jpg?width=352&name=photo-1504868584819-f8e8b4b6d7e3-1.jpg)](https://thedeveloper.javierfuentes.cl/blog/writing-accessible-forms-labels-errors-and-hints)

### [Writing Accessible Forms: Labels, Errors, and Hints](https://thedeveloper.javierfuentes.cl/blog/writing-accessible-forms-labels-errors-and-hints)

 Forms are among the most critical and most frequently inaccessible components on the web. Proper...

[![](https://thedeveloper.javierfuentes.cl/hs-fs/hubfs/Imported_Blog_Media/photo-1542831371-29b0f74f9713-2.jpg?width=352&name=photo-1542831371-29b0f74f9713-2.jpg)](https://thedeveloper.javierfuentes.cl/blog/semantic-html-the-foundation-of-accessible-development)

### [Semantic HTML: The Foundation of Accessible Development](https://thedeveloper.javierfuentes.cl/blog/semantic-html-the-foundation-of-accessible-development)

 Before reaching for ARIA, lean on semantic HTML. Elements like nav, main, article, section, and...

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