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css-performance

Extract critical CSS, purge unused styles, and analyze bundles.

1|Updated Nov 18, 2025
Search Tags:#performance#optimization#css#code splitting#minification#critical css#purging
One-click install
npx skills add https://github.com/pluginagentmarketplace/custom-plugin-css --skill css-performance
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: css-performance
Source: https://github.com/pluginagentmarketplace/custom-plugin-css/tree/main/skills/css-performance
Command: npx skills add https://github.com/pluginagentmarketplace/custom-plugin-css --skill css-performance

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes assets (resource) and scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the critical need to improve website loading times and user experience by optimizing CSS delivery and reducing its impact on performance.

Core Features & Use Cases

  • Critical CSS Extraction: Identifies and inlines essential CSS for above-the-fold content.
  • CSS Purging: Removes unused CSS rules to reduce file size.
  • Minification & Code Splitting: Applies advanced techniques to further optimize CSS delivery.
  • Use Case: A developer needs to ensure their e-commerce site loads quickly on mobile devices. This Skill can help them identify and inline critical CSS, purge unused styles from a large framework, and configure tools for efficient code splitting.

Quick Start

Use the css-performance skill to optimize CSS by extracting critical CSS and purging unused styles.

Frequently Asked Questions about css-performance

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

FAQPage Schema
How do I extract critical CSS for above-the-fold content?▼

Critical CSS extraction identifies and inlines essential styles needed for above-the-fold content rendering. This process reduces performance bottlenecks by ensuring the browser paints initial visible content immediately without waiting for the full stylesheet.

What's the best way to purge unused CSS from a large framework?▼

Purging unused CSS rules using PurgeCSS scans your codebase to remove unreferenced styles from large frameworks. This eliminates dead CSS rules, drastically reducing file size and improving overall loading times.

How does CSS code splitting and minification improve mobile loading times?▼

CSS code splitting and minification improve mobile loading times by breaking down large stylesheets and compressing code using cssnano. This reduces file size and optimizes CSS delivery, addressing mobile rendering bottlenecks for faster page loads.

Can I use this for production-ready bundle analysis on an e-commerce site?▼

Yes, this Skill performs production-ready bundle analysis for e-commerce sites. It utilizes tools like PurgeCSS and cssnano to analyze CSS bundles, providing measurable metrics to ensure fast mobile loading and efficient rendering.

Why does my CSS file size impact website rendering performance?▼

CSS file size impacts website rendering performance because large stylesheets block the browser from quickly painting content. This Skill addresses these bottlenecks by reducing file size through purging, minification, and critical CSS extraction.

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