Performance Optimization

by addyosmani

Performance Optimization is a Quality skill for Claude Code, published by addyosmani in agent-skills.

86.7K stars9.3K forkson addyosmani/agent-skillsAdded 2026/08/13Repository updated 2026/08/11

View source on GitHub Download repo ZIP

agent-skillsantigravityclaude-codecodexcursorskills

Install in seconds

Install Performance Optimization

Copy Performance Optimization into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/addyosmani/agent-skills/tree/main/skills/performance-optimization ~/.claude/skills/performance-optimization

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/addyosmani/agent-skills.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: skills/performance-optimization/SKILL.md in addyosmani/agent-skills
Installs to: ~/.claude/skills/performance-optimization
Collection: One of 24 skills cataloged from this repository
Category: Quality — 1354 skills

What Performance Optimization does

Performance Optimization measures bottlenecks and optimizes frontend, backend, queries, and databases. Use when performance requirements exist, when you suspect regressions, when Core Web Vitals need improvement, or when profiling reveals bottlenecks.

Performance Optimization is cataloged under Quality on DirSkills. Performance Optimization comes from a repository tagged agent-skills, antigravity, claude-code, codex and cursor.

Documentation

README

Excerpt

Performance Optimization

Overview

Measure before optimizing. Performance work without measurement is guessing — and guessing leads to premature optimization that adds complexity without improving what matters. Profile first, identify the actual bottleneck, fix it, measure again. Optimize only what measurements prove matters.

When to Use

Performance requirements exist in the spec (load time budgets, response time SLAs)
Users or monitoring report slow behavior
Core Web Vitals scores are below thresholds
You suspect a change introduced a regression
Building features that handle large datasets or high traffic

When NOT to use: Don't optimize before you have evidence of a problem. Premature optimization adds complexity that costs more than the performance it gains.

This is the opening of the README. Read the full README on GitHub.

Commands Performance Optimization provides

Slash commands named in this skill’s SKILL.md, listed in the order they first appear.

/hero-mobile-800
/hero-1200
/hero-1600

Frequently asked about Performance Optimization

What else does addyosmani publish alongside Performance Optimization?
Performance Optimization is one of 24 skills that DirSkills catalogs from addyosmani/agent-skills, the repository it ships in. Its siblings there include API and Interface Design, Agent Skill Discovery and Browser Testing. Each one is a separate skill with its own page in this directory, installs the same way Performance Optimization does, and is maintained by addyosmani in that same repository. The rest of the collection is listed on the addyosmani/agent-skills page.
How does Performance Optimization compare to other Quality skills?
Performance Optimization ranks #23 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Performance Optimization against them. Open each page to compare what they document and how they install.