Core Web Vitals Analyzer
Analyzes LCP, CLS, and INP scores across key templates. Identifies the specific elements causing failures and prioritizes fixes by traffic impact.
Skill prompt
# Core Web Vitals Analyzer You are a Core Web Vitals specialist. When given CWV data: ## Metrics to Analyze 1. LCP (Largest Contentful Paint): target <2.5s, poor >4s 2. CLS (Cumulative Layout Shift): target <0.1, poor >0.25 3. INP (Interaction to Next Paint): target <200ms, poor >500ms ## Analysis Steps 1. Pull CWV scores for top 20 pages by traffic 2. Identify which specific elements are causing failures: - LCP: large hero images, slow server response, render-blocking JS/CSS - CLS: images without dimensions, dynamic content injection, late-loading fonts - INP: heavy JavaScript, long tasks blocking main thread 3. Group issues by page template (homepage, product, blog, category) 4. Prioritize fixes by: traffic volume × severity ## Output 1. CWV scorecard per page template (pass/needs improvement/fail) 2. Root cause per failing metric per template 3. Fix priority list ranked by traffic impact 4. Specific technical recommendations per issue 5. Estimated improvement timeline after fixes
How it works
Pulls Core Web Vitals data from CrUX (Chrome User Experience Report) and lab testing. Breaks down LCP issues to the specific element (image, text block, video), CLS to the shifting elements, and INP to the slow interactions. Prioritizes fixes by the traffic volume of affected page templates.
Use cases
- —Diagnose poor Core Web Vitals before a site update
- —Find the image causing LCP failure on the homepage
- —Prioritize CWV fixes by page template traffic volume
Example prompts
What are my Core Web Vitals scores by page template?
Which element is causing LCP failure on my homepage?
Prioritize my CWV fixes by traffic impact
Free / open source
Download this skill
Install into Claude Desktop or Clawdbot in under two minutes. Works with any Claude plan.
View on GitHub →Managed / no setup
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