Official agent skill

Web Perf

Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores.

OfficialApache-2.0Auto-check passedFrontend & Design

Install Web Perf

skills CLI

$ npx skills add cloudflare/skills --skill web-perf -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install cloudflare/skills web-perf --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/web-perf .claude/skills/web-perf && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "web-perf" agent skill from https://github.com/cloudflare/skills/tree/main/skills/web-perf into .claude/skills/web-perf/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-perf", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/cloudflare/skills/tree/main/skills/web-perf

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add cloudflare/skills --skill web-perf -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install cloudflare/skills web-perf --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/web-perf .agents/skills/web-perf && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "web-perf" agent skill from https://github.com/cloudflare/skills/tree/main/skills/web-perf into .agents/skills/web-perf/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-perf", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add cloudflare/skills --skill web-perf -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install cloudflare/skills web-perf --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/web-perf .cursor/skills/web-perf && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "web-perf" agent skill from https://github.com/cloudflare/skills/tree/main/skills/web-perf into .cursor/skills/web-perf/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-perf", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/cloudflare/skills.git --path skills/web-perf

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add cloudflare/skills --skill web-perf -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install cloudflare/skills web-perf --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/web-perf .gemini/skills/web-perf && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "web-perf" agent skill from https://github.com/cloudflare/skills/tree/main/skills/web-perf into .gemini/skills/web-perf/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-perf", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install cloudflare/skills web-perf

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add cloudflare/skills --skill web-perf -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/web-perf .github/skills/web-perf && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "web-perf" agent skill from https://github.com/cloudflare/skills/tree/main/skills/web-perf into .github/skills/web-perf/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-perf", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add cloudflare/skills --skill web-perf -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install cloudflare/skills web-perf --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/web-perf .opencode/skills/web-perf && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "web-perf" agent skill from https://github.com/cloudflare/skills/tree/main/skills/web-perf into .opencode/skills/web-perf/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-perf", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: web-perf
GitHub stars: 3k
Used in: 3 other repos
Token cost: ~2.1k tokens
SKILL.md length: 836 words
Files: 1
Skills in repo: 16
Repo updated: Oct 1, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores.

Works in 4 steps: Performance Trace → Core Web Vitals Analysis → Network Analysis → …
Tasks that involve Web performance
SKILL.md covers Retrieval Sources, FIRST: Verify MCP Tools…, Key Guidelines and Quick Reference, plus 3 more sections
Reaches developer.chrome.com and web.dev

What it does

Web Perf is an agent skill from cloudflare/skills, published by the product's own GitHub organization. Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores.

Its SKILL.md is about 2.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering Web performance. The repository describes itself as: Skills for teaching agents how to build on Cloudflare. The licence is Apache-2.0.

When your agent uses it

Tasks that involve Web performance

Example prompts

“/web-perf”

Workflow steps

4 steps, taken from the step headings in SKILL.md.

Performance Trace
Core Web Vitals Analysis
Network Analysis
Accessibility Snapshot

What it can do on your machine

Read from SKILL.md and the folder at commit 41e0d19. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are json).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- developer.chrome.com
- web.dev
Also links to:
- github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Web Perf loads about 2.1k tokens when it runs. Until then it costs about 34 tokens; SKILL.md has 836 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~34
When it runs · the whole SKILL.md, loaded when a task matches: ~2.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from cloudflare/skills at commit 41e0d19, republished under its Apache-2.0 licence (© cloudflare). 836 words, ~2,064 tokens.

Download SKILL.mdSave it as .claude/skills/web-perf/SKILL.md (or your agent's skills folder).

name: web-perf
description: Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores.

Web Performance Audit

Your knowledge of web performance metrics, thresholds, and tooling APIs may be outdated. Prefer retrieval over pre-training when citing specific numbers or recommendations.

Retrieval Sources

Source	How to retrieve	Use for
web.dev	`https://web.dev/articles/vitals`	Core Web Vitals thresholds, definitions
Chrome DevTools docs	`https://developer.chrome.com/docs/devtools/performance`	Tooling APIs, trace analysis
Lighthouse scoring	`https://developer.chrome.com/docs/lighthouse/performance/performance-scoring`	Score weights, metric thresholds

FIRST: Verify MCP Tools Available

Discover available browser and performance tools before starting. Use the capabilities available for the requested audit. If trace tools are unavailable, continue any useful source or network analysis and state which measurements could not be collected.

If the user wants Chrome DevTools MCP setup, consult its installation guide and use the latest package version. Only change MCP configuration when setup is within the user's authorized scope; otherwise ask first. For clients using command and args, an example server entry is:

json

"chrome-devtools": {
  "command": "npx",
  "args": ["-y", "chrome-devtools-mcp@latest"]
}

Key Guidelines

Be assertive: Verify claims by checking network requests, DOM, or codebase—then state findings definitively.
Verify before recommending: Confirm something is unused before suggesting removal.
Quantify impact: Use estimated savings from insights. Don't prioritize changes with 0ms impact.
Skip non-issues: If render-blocking resources have 0ms estimated impact, note but don't recommend action.
Be specific: Say "compress hero.png (450KB) to WebP" not "optimize images".
Prioritize ruthlessly: A site with 200ms LCP and 0 CLS is already excellent—say so.

Quick Reference

Task	Tool Call
Load page	`navigate_page(url: "...")`
Start trace	`performance_start_trace(autoStop: true, reload: true)`
Analyze insight	`performance_analyze_insight(insightSetId: "...", insightName: "...")`
List requests	`list_network_requests(resourceTypes: ["Script", "Stylesheet", ...])`
Request details	`get_network_request(reqid: <id>)`
A11y snapshot	`take_snapshot(verbose: true)`

Workflow

Copy this checklist to track progress:

Audit Progress:
- [ ] Phase 1: Performance trace (navigate + record)
- [ ] Phase 2: Core Web Vitals analysis (includes CLS culprits)
- [ ] Phase 3: Network analysis
- [ ] Phase 4: Accessibility snapshot
- [ ] Phase 5: Codebase analysis (skip if third-party site)

Phase 1: Performance Trace

Navigate to the target URL:
```
navigate_page(url: "<target-url>")
```
Start a performance trace with reload to capture cold-load metrics:
```
performance_start_trace(autoStop: true, reload: true)
```
Wait for trace completion, then retrieve results.

Troubleshooting:

If trace returns empty or fails, verify the page loaded correctly with navigate_page first
If insight names don't match, inspect the trace response to list available insights

Phase 2: Core Web Vitals Analysis

Use performance_analyze_insight to extract key metrics.

Note: Insight names may vary across Chrome DevTools versions. If an insight name doesn't work, check the insightSetId from the trace response to discover available insights.

Common insight names:

Metric	Insight Name	What to Look For
LCP	`LCPBreakdown`	Time to largest contentful paint; breakdown of TTFB, resource load, render delay
CLS	`CLSCulprits`	Elements causing layout shifts (images without dimensions, injected content, font swaps)
Render Blocking	`RenderBlocking`	CSS/JS blocking first paint
Document Latency	`DocumentLatency`	Server response time issues
Network Dependencies	`NetworkRequestsDepGraph`	Request chains delaying critical resources

Example:

performance_analyze_insight(insightSetId: "<id-from-trace>", insightName: "LCPBreakdown")

Key thresholds (good/needs-improvement/poor):

TTFB: < 800ms / < 1.8s / > 1.8s
FCP: < 1.8s / < 3s / > 3s
LCP: < 2.5s / < 4s / > 4s
INP: < 200ms / < 500ms / > 500ms
TBT: < 200ms / < 600ms / > 600ms
CLS: < 0.1 / < 0.25 / > 0.25
Speed Index: < 3.4s / < 5.8s / > 5.8s

Show full SKILL.md (392 more words)Show less

Phase 3: Network Analysis

List all network requests to identify optimization opportunities:

list_network_requests(resourceTypes: ["Script", "Stylesheet", "Document", "Font", "Image"])

Look for:

Render-blocking resources: JS/CSS in <head> without async/defer/media attributes
Network chains: Resources discovered late because they depend on other resources loading first (e.g., CSS imports, JS-loaded fonts)
Missing preloads: Critical resources (fonts, hero images, key scripts) not preloaded
Caching issues: Missing or weak Cache-Control, ETag, or Last-Modified headers
Large payloads: Uncompressed or oversized JS/CSS bundles
Unused preconnects: If flagged, verify by checking if ANY requests went to that origin. If zero requests, it's definitively unused—recommend removal. If requests exist but loaded late, the preconnect may still be valuable.

For detailed request info:

get_network_request(reqid: <id>)

Phase 4: Accessibility Snapshot

Take an accessibility tree snapshot:

take_snapshot(verbose: true)

Flag high-level gaps:

Missing or duplicate ARIA IDs
Elements with poor contrast ratios (check against WCAG AA: 4.5:1 for normal text, 3:1 for large text)
Focus traps or missing focus indicators
Interactive elements without accessible names

Phase 5: Codebase Analysis

Skip if auditing a third-party site without codebase access.

Analyze the codebase to understand where improvements can be made.

Detect Framework & Bundler

Search for configuration files to identify the stack:

Tool	Config Files
Webpack	`webpack.config.js`, `webpack.*.js`
Vite	`vite.config.js`, `vite.config.ts`
Rollup	`rollup.config.js`, `rollup.config.mjs`
esbuild	`esbuild.config.js`, build scripts with `esbuild`
Parcel	`.parcelrc`, `package.json` (parcel field)
Next.js	`next.config.js`, `next.config.mjs`
Nuxt	`nuxt.config.js`, `nuxt.config.ts`
SvelteKit	`svelte.config.js`
Astro	`astro.config.mjs`

Also check package.json for framework dependencies and build scripts.

Tree-Shaking & Dead Code

Webpack: Check for mode: 'production', sideEffects in package.json, usedExports optimization
Vite/Rollup: Tree-shaking enabled by default; check for treeshake options
Look for: Barrel files (index.js re-exports), large utility libraries imported wholesale (lodash, moment)

Unused JS/CSS

Check for CSS-in-JS vs. static CSS extraction
Look for PurgeCSS/UnCSS configuration (Tailwind's content config)
Identify dynamic imports vs. eager loading

Polyfills

Check for @babel/preset-env targets and useBuiltIns setting
Look for core-js imports (often oversized)
Check browserslist config for overly broad targeting

Compression & Minification

Check for terser, esbuild, or swc minification
Look for gzip/brotli compression in build output or server config
Check for source maps in production builds (should be external or disabled)

Output Format

Present findings as:

Core Web Vitals Summary - Table with metric, value, and rating (good/needs-improvement/poor)
Top Issues - Prioritized list of problems with estimated impact (high/medium/low)
Recommendations - Specific, actionable fixes with code snippets or config changes
Codebase Findings - Framework/bundler detected, optimization opportunities (omit if no codebase access)

Files

Just SKILL.md in skills/web-perf of cloudflare/skills.

Open the folder on GitHubat commit 41e0d19

Used in 3 other repositories

We found 4 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in cloudflare/skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Web Perf next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Web Perf compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Web Perf this skillcloudflare/skills	3k	3 repos	~2.1k	Automated safety check: Pass	Apache-2.0	6 days ago
React Doctormakeplane/plane	60k	12 repos	~657	Automated safety check: Pass	AGPL-3.0	yesterday
Fixing Motion Performanceibelick/ui-skills	9.4k	5 repos	~1.4k	Automated safety check: Pass	MIT	yesterday
GSAP Performance Tuninggreensock/gsap-skills	16k	4 repos	~1k	Automated safety check: Pass	MIT	2 mo ago
React Frontend Development Guidelinesdiet103/claude-code-infrastructure-showcase	10k	2 repos	~2.9k	Automated safety check: Pass	MIT	2 mo ago
Web Quality Auditaddyosmani/web-quality-skills	2.9k	—	~2.6k	Automated safety check: Pass	MIT	1 mo ago

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Questions about Web Perf

What does Web Perf do?

Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores. Web Perf is an agent skill from cloudflare/skills, published by the product's own GitHub organization. Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores.

When should I use Web Perf?

Web Perf fits situations like: tasks that involve Web performance.

How do I install Web Perf in Claude Code?

Run `npx skills add cloudflare/skills --skill web-perf -a claude-code`. Or copy the skill folder (skills/web-perf in cloudflare/skills) into .claude/skills/web-perf in your project. Claude Code loads it when a task matches its description.

How do I install Web Perf in Codex?

Run `npx skills add cloudflare/skills --skill web-perf -a codex`. Or copy the skill folder (skills/web-perf in cloudflare/skills) into .agents/skills/web-perf in your project. Codex loads it when a task matches its description.

Can I use Web Perf in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cloudflare/skills --skill web-perf -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/web-perf, .gemini/skills/web-perf, .github/skills/web-perf and .opencode/skills/web-perf in your project.

What does Web Perf need to run?

SKILL.md names no scripts, command-line tools or credentials: Web Perf is instructions for the agent only.

Does Web Perf access the network?

SKILL.md names 3 domains. In commands or code: developer.chrome.com and web.dev; the agent is likely to contact these when it follows the instructions. As links in the text: github.com. This is read from the text; nothing was executed.

Is Web Perf safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Web Perf use?

Web Perf is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Web Perf use?

About 2.1k tokens (SKILL.md is roughly 8.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Web Perf?

Skills that share tags, products or a category with Web Perf: React Doctor (makeplane/plane, 60k stars), Fixing Motion Performance (ibelick/ui-skills, 9.4k stars), GSAP Performance Tuning (greensock/gsap-skills, 16k stars) and React Frontend Development Guidelines (diet103/claude-code-infrastructure-showcase, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Web Perf?

cloudflare (a GitHub organization, an official publisher) maintains it in cloudflare/skills, which has 2,999 GitHub stars. The repository holds 16 skills in this directory. The repository was last updated on October 1, 2026.

Source: cloudflare/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Web Perf

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Web Performance Audit

Retrieval Sources

FIRST: Verify MCP Tools Available

Key Guidelines

Quick Reference

Workflow

Phase 1: Performance Trace

Phase 2: Core Web Vitals Analysis

Phase 3: Network Analysis

Phase 4: Accessibility Snapshot

Phase 5: Codebase Analysis

Detect Framework & Bundler

Tree-Shaking & Dead Code

Unused JS/CSS

Polyfills

Compression & Minification

Output Format

Files

Used in 3 other repositories

Compare with similar skills

Similar skills

More from cloudflare/skills

Related

Questions about Web Perf