Skill

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.

npx claudepluginhub serkan-ozal/browser-devtools-claude --plugin browser-devtools-mcp

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This skill uses the workspace's default tool permissions.

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

SKILL.md

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Last CommitFeb 26, 2026

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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

Metric	Good	Needs Work	Poor
LCP	≤2.5s	2.5-4s	>4s
INP	≤200ms	200-500ms	>500ms
CLS	≤0.1	0.1-0.25	>0.25
TTFB	≤800ms	800-1800ms	>1800ms

Audit Workflow

Baseline: Get initial Web Vitals metrics
Network: Analyze slow/large requests
Resources: Check for render-blocking resources
JavaScript: Look for long tasks
Images: Check for unoptimized images
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