# Performance (agent 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/addyosmani/web-quality-skills |
| Skill path | skills/performance/SKILL.md |
| Skill name | performance |
| GitHub stars | 2,898 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 3 |
| Plugin marketplace | addy-web-quality-skills |
| Official | no |
| Works with | Claude Code, Codex, Cursor, Gemini CLI, OpenCode |
| Category | Security |
| Last commit | Aug 24, 2026 |

## 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"

## Add this skill

### Claude Code

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

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

### ChatGPT / Codex

```sh
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
```

### Cursor

```sh
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
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

---

Canonical page: https://appsgit.com/skills/addyosmani-performance
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