web-performance

Analyze web application performance against Core Web Vitals metrics.

1|Updated Apr 29, 2026

Search Tags:#performance optimization #web performance #Lighthouse #Core Web Vitals #PSI

Ready to run

npx skills add https://github.com/sigmadigitalza/engineering-playbook --skill web-performance-sigmadigitalza

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: web-performance
Source: https://github.com/sigmadigitalza/engineering-playbook/tree/main/plugins/sigma-engineering/skills/web-performance
Command: npx skills add https://github.com/sigmadigitalza/engineering-playbook --skill web-performance-sigmadigitalza

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires lighthouse, pagespeed-insights, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the challenge of improving web application performance by providing a detailed audit against Core Web Vitals (LCP, INP, CLS) and other critical metrics, identifying areas for quick wins and optimizing changes.

Core Features & Use Cases

Performance Audit: Evaluates web applications for performance issues against Core Web Vitals and adjacent metrics.
Quick Wins Identification: Suggests immediate fixes for common performance issues.
Predictive Analysis: Assesses the potential impact of recommended changes on user experience.
Use Case: For a web application experiencing slow page loads, this Skill can help identify performance bottlenecks and provide actionable recommendations to improve load times and user engagement.

Quick Start

Use the web-performance skill to audit the performance of the web application at 'https://example.com'.

Frequently Asked Questions about web-performance

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I audit my web application against Core Web Vitals?▼

You can automate Core Web Vitals audits using this Skill to evaluate LCP, INP, and CLS metrics. It analyzes static code and live sites to identify performance bottlenecks and deliver actionable optimization recommendations.

What is the difference between lab and field data in web performance testing?▼

Web performance testing distinguishes lab data from field data by using Lighthouse for simulated environment testing and PageSpeed Insights for real-user field data. This Skill combines both to provide comprehensive performance analysis.

How do I identify quick wins for website load time optimization?▼

You can identify quick wins for website load time optimization by running an audit with this Skill. It evaluates your application against critical metrics, suggests immediate fixes, and predicts the impact of recommended changes on user experience.

Do I need Lighthouse and PageSpeed Insights to run a performance audit?▼

Yes, you need Lighthouse and PageSpeed Insights dependencies to run a comprehensive performance audit with this Skill. They provide the necessary lab and field data to evaluate Core Web Vitals and adjacent performance metrics.

Can I use Lighthouse for static code reviews without a live URL?▼

You can apply this Skill to static code reviews without a live URL by analyzing your codebase against Core Web Vitals. It evaluates performance issues and provides optimization insights without needing a running live site.

What are the limitations of using Core Web Vitals for performance optimization?▼

A limitation of focusing only on Core Web Vitals is missing adjacent metrics affecting user experience. This Skill mitigates this by evaluating adjacent metrics alongside LCP, INP, and CLS to provide a holistic performance optimization view.