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Performance audit

Skill serkan-ozal/browser-devtools-claude/skills/performance-audit

Analyze web page performance using Web Vitals and network timing metrics. Use when optimizing load times, checking Core Web Vitals, or investigating slow pages.From its SKILL.md

Install
npx -y skills add serkan-ozal/browser-devtools-claude --skill performance-audit

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SKILL.md

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Performance Audit Skill

Analyze web page performance using Web Vitals and network timing metrics.

When to Use

This skill activates when:

  • User asks about page performance or speed
  • User wants to optimize load times
  • User mentions slow page or poor user experience
  • User needs Core Web Vitals metrics
  • User asks about SEO performance factors

Capabilities

Web Vitals Analysis

  • Get Core Web Vitals (o11y_get-web-vitals)
    • LCP (Largest Contentful Paint)
    • INP (Interaction to Next Paint)
    • CLS (Cumulative Layout Shift)
    • TTFB (Time to First Byte)
    • FCP (First Contentful Paint)

Network Performance

  • Analyze request timing (o11y_get-http-requests)
  • Identify slow API calls
  • Check resource sizes
  • Find blocking resources

Visual Analysis

  • Capture page at different load stages
  • Identify layout shifts visually
  • Check above-the-fold content

JavaScript Analysis

  • Profile JavaScript execution
  • Check for long tasks
  • Identify render-blocking scripts

Performance Thresholds

MetricGoodNeeds WorkPoor
LCP≤2.5s2.5-4s>4s
INP≤200ms200-500ms>500ms
CLS≤0.10.1-0.25>0.25
TTFB≤800ms800-1800ms>1800ms

Audit Workflow

  1. Baseline: Get initial Web Vitals metrics
  2. Network: Analyze slow/large requests
  3. Resources: Check for render-blocking resources
  4. JavaScript: Look for long tasks
  5. Images: Check for unoptimized images
  6. Report: Summarize with recommendations

Common Issues

  • Large unoptimized images
  • Render-blocking CSS/JS
  • Too many HTTP requests
  • Slow server response (TTFB)
  • Layout shifts from dynamic content
  • Uncompressed resources

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