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Web Performance Optimization

Checked
secondsky·vlatest·frontend·MIT

Helps with web development, performance optimization, optimization as part of building frontend UIs and user experiences workflows.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add secondsky/claude-skills --skill web-performance-optimization -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

secondsky

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned secondsky/claude-skills at 8837836131.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
8837836131
Manifest
plugins/web-performance-optimization/skills/web-performance-optimization/SKILL.md
Scanned
3 files, 749 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill helps improve website performance by implementing optimization strategies. It focuses on techniques like lazy loading, code splitting, caching, compression, and monitoring to enhance Core Web Vitals and overall user experience. The skill provides examples of how to implement these optimizations using React, Webpack, image tags with srcset and loading="lazy", and service worker caching.

When to use it

This skill is useful in the following situations:

  • When dealing with slow page load times.
  • To address high Largest Contentful Paint (LCP) scores.
  • For websites experiencing large bundle sizes.
  • To reduce Cumulative Layout Shift (CLS).
  • When optimizing mobile performance.

Key capabilities

  • Lazy Loading: Deferring the loading of non-critical resources until they are needed.
  • Code Splitting (React): Breaking down JavaScript bundles into smaller chunks for faster initial load times, demonstrated with React components and lazy.
  • Webpack Bundle Optimization: Configuring Webpack to split code into vendor and application chunks.
  • Image Optimization: Using <picture> tags with srcset attributes and the loading="lazy" attribute for efficient image delivery. Also includes using webp format.
  • Service Worker Caching: Implementing caching strategies using service workers to improve offline performance and reduce server load.
  • Core Web Vitals Monitoring: Tracking metrics like LCP, CLS, and INP (as of March 2024) for ongoing optimization efforts.

Example prompts

Here are some example prompts you could give an AI agent with this skill:

  • "How can I implement code splitting in my React application?"
  • "Show me how to optimize images using the <picture> tag."
  • "Can you provide a basic service worker caching implementation?"
  • "What are some strategies for reducing my website's bundle size?"

Tips & gotchas

  • This skill provides code examples, so familiarity with web development concepts and tools like React and Webpack is helpful.
  • The sendToAnalytics function in the Core Web Vitals Monitoring example is a placeholder; you’ll need to replace it with your actual analytics implementation.
  • INP (Interaction to Next Paint) has replaced FID (First Input Delay) as of March 2024 for Core Web Vital monitoring.