# Core Web Vitals improvement (/performance--web-vitals)

/performance--web-vitals is a Claude Code skill in the Code section. Measures your site's LCP, INP and CLS, diagnoses their causes in the code and applies fixes to reach the recommended thresholds.

- Web version: https://skills.sgomez.dev/en/s/performance--web-vitals
- Section: [Code](https://skills.sgomez.dev/en/code.md)
- Author: Santiago Gómez de la Torre
- License: MIT
- Source: https://github.com/sgomez-dev/claude-skills/blob/main/skills/performance/web-vitals.md
- Updated 10 Jul 2026

## How to ask for it

- `/performance--web-vitals measure Core Web Vitals for my site`
- `/performance--web-vitals why is my LCP so high`
- `/performance--web-vitals fix the CLS that's hurting my Google ranking`

## Install

macOS · Linux:

```
curl -fsSL https://raw.githubusercontent.com/sgomez-dev/claude-skills/main/install.sh | bash
```

Windows:

```
irm https://raw.githubusercontent.com/sgomez-dev/claude-skills/main/install.ps1 | iex
```

Claude Code plugin:

```
/plugin marketplace add sgomez-dev/claude-skills
/plugin install performance-skills@claude-skills-collection
```

## Permissions

- Reads: `**/*`
- Writes: `**/*.{js,jsx,ts,tsx,vue,svelte,astro,html,css}`, `next.config.*`, `vite.config.*`, `nuxt.config.*`
- Runs: —
- Network: No
- Destructive: No

## Author's description

Core Web Vitals - measure LCP/INP/CLS, diagnose causes, fix with code changes

- [How we review this](https://skills.sgomez.dev/en/methodology.md)