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Performance

Performance is an agent skill (a SKILL.md file) from addyosmani/web-quality-skills. Optimize web performance for faster loading and better user experience. It works with Claude Code, Codex, Cursor, Gemini CLI and OpenCode and has 2,898 GitHub stars across a repository of 3 listed skills.

github.com/addyosmani/web-quality-skills/skills/performance (opens in a new tab)

  • Multi-skill repo
  • Plugin marketplace
  • Security
  • Actively maintained
View on GitHub (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add addyosmani/web-quality-skills
/plugin install web-quality-skills@addy-web-quality-skills

In the Claude apps, zip the performance folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/addyosmani/web-quality-skills.git
cp -r web-quality-skills/skills/performance .agents/skills/performance   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/addyosmani/web-quality-skills.git
cp -r web-quality-skills/skills/performance .cursor/skills/performance   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Optimize web performance for faster loading and better user experience. Use when asked to "speed up my site", "optimize performance", "reduce load time", "fix slow loading", "improve page speed", or "performance audit". Evidence-led performance optimization using real-user signals for prioritization and browser traces for diagnosis. Focuses on loading speed, runtime responsiveness, and resource delivery.

When it triggers

  • Use when asked to "speed up my site", "optimize performance", "reduce load time", "fix slow loading", "improve page speed", or "performance audit".
  • "speed up my site"
  • "optimize performance"
  • "reduce load time"
  • "fix slow loading"
  • "improve page speed"
  • "performance audit"

More skills in addyosmani/web-quality-skills

3 skills are listed from this repository.

Similar skills

More security skills

All Security

FAQ

Performance FAQ

Still curious? Email info@appsgit.com.

What is the Performance skill?

Performance is an agent skill (a SKILL.md file) from addyosmani/web-quality-skills. Optimize web performance for faster loading and better user experience. It works with Claude Code, Codex, Cursor, Gemini CLI and OpenCode and has 2,898 GitHub stars across a repository of 3 listed skills. Its SKILL.md lives at github.com/addyosmani/web-quality-skills/skills/performance.

How do I install the Performance skill?

In Claude Code, run /plugin marketplace add addyosmani/web-quality-skills and then /plugin install web-quality-skills@addy-web-quality-skills. For Codex or Cursor, copy the performance folder into .agents/skills/ or .cursor/skills/.

Is the Performance skill free?

Yes. The repository is open source under the MIT license.

Is Performance maintained?

The repository's most recent commit was on Aug 24, 2026. appsgit only lists skills from repositories with a commit in the last six months.