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Core Web Vitals optimization subagent v1.0.0

Use this resource to improve a site's Core Web Vitals and track them over time

New

  • 152 downloads
  • 219 likes
  • 182 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install web-vitals-subagent

First time: connect the CLI with

npx --yes palatekit@latest login

Your main agent calls it for a slow or unstable site: it measures the current state, finds the causes of LCP, FID and CLS, applies targeted fixes (images, critical resources, layout) and checks the gain with before-and-after measurements.

Mostly picked by

Updated November 2, 2026

Card for “Core Web Vitals optimization subagent”

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • The subagent file (in English): target metrics, audit method and goals
  • Guidance on performance budgets and resource loading

Good fit for

  • A showcase site whose images delay display
  • A page whose layout shifts while it loads

Not for

    Tags

    • core web vitals
    • performance
    • lcp
    • cls

    About

    You say

    “Measure the Core Web Vitals of the home page and fix what makes the layout shift.”

    Card for “Core Web Vitals optimization subagent”

    Subagent published by davila7 under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Copy the file into .claude/agents/ (project) or ~/.claude/agents/ (all your projects)
    2. Ask your agent to improve a site's Core Web Vitals and track them over time, or call the subagent by name
    3. Review its work

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • web-vitals-subagent.md1.4 KB

    Origin and licence

    Listed unmodified

    Author
    davila7
    Source
    github.com/davila7/claude-code-templates/blob/f57964ebda91cdfb31755661ecea9395f30020f1/cli-tool/components/agents/performance-testing/web-vitals-optimizer.md
    Licence
    MIT

    Notice

    « web-vitals-optimizer » (davila7, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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