Electron DevTools Trace Analysis
keybase/client
Analyzes Chrome or Electron DevTools Performance trace exports with Python scripts to find where render time actually goes, without opening DevTools.
Comprehensive performance specialist covering analysis, optimization, load testing, and framework-specific performance.
Install Performance
$ npx skills add aiskillstore/marketplace --skill performance -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace performance --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/89jobrien/performance .claude/skills/performance && rm -rf skills-srcUse ~/.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/
Install the "performance" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/89jobrien/performance into .claude/skills/performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance", 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 install https://github.com/aiskillstore/marketplace/tree/main/skills/89jobrien/performanceType 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.
$ npx skills add aiskillstore/marketplace --skill performance -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace performance --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/89jobrien/performance .agents/skills/performance && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "performance" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/89jobrien/performance into .agents/skills/performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance", 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.
$ npx skills add aiskillstore/marketplace --skill performance -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace performance --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/89jobrien/performance .cursor/skills/performance && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "performance" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/89jobrien/performance into .cursor/skills/performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance", 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 https://github.com/aiskillstore/marketplace.git --path skills/89jobrien/performance--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add aiskillstore/marketplace --skill performance -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace performance --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/89jobrien/performance .gemini/skills/performance && rm -rf skills-srcUse ~/.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/
Install the "performance" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/89jobrien/performance into .gemini/skills/performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance", 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.
$ gh skill install aiskillstore/marketplace performanceInstalls 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).
$ npx skills add aiskillstore/marketplace --skill performance -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/89jobrien/performance .github/skills/performance && rm -rf skills-srcUse ~/.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/
Install the "performance" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/89jobrien/performance into .github/skills/performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance", 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.
$ npx skills add aiskillstore/marketplace --skill performance -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace performance --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/89jobrien/performance .opencode/skills/performance && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "performance" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/89jobrien/performance into .opencode/skills/performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance", 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
performance- GitHub stars
- 430
- Used in
- 1 other repo
- Token cost
- ~2.6k tokens
- SKILL.md length
- 593 words
- Files
- 6 (incl. references)
- Skills in repo
- 1,085
- Repo updated
- First seen
- Licence
- None found
At a glance
Comprehensive performance specialist covering analysis, optimization, load testing, and framework-specific performance.
- Works in 4 steps: Establish Baseline → Identify Bottlenecks → Analyze Root Cause → …
- Identifying bottlenecks
- SKILL.md covers When to Use This Skill, What This Skill Does, How to Use and Analysis Areas, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Performance is an agent skill from aiskillstore/marketplace. Comprehensive performance specialist covering analysis, optimization, load testing, and framework-specific performance. Use when identifying bottlenecks, optimizing code, conducting load tests, analyzing Core Web Vitals, fixing memory leaks, or improving application performance across all layers (application, database, frontend). Includes React-specific optimization patterns.
Its SKILL.md is about 2.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `references/framework-patterns.md`, `references/load-testing.md` and `references/performance-analysis.template.md`).
It sits in Testing & QA, covering Load testing, Web performance and Performance optimization. It works with React. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Identifying bottlenecks
- Optimizing code
- Conducting load tests
- Analyzing Core Web Vitals
Example prompts
- “/performance”
Requirements
- Node.js
Workflow steps
4 steps, taken from the step headings in SKILL.md.
- Establish Baseline
- Identify Bottlenecks
- Analyze Root Cause
- Provide Optimization Recommendations
What it can do on your machine
Read from SKILL.md and the folder at commit 4ac52da. 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 javascript and markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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
Performance loads about 2.6k tokens when it runs, and up to ~9.2k if it reads all its reference files. Until then it costs about 98 tokens; SKILL.md has 593 words of instructions outside code blocks.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 593 words (~2,636 tokens).
“This skill provides comprehensive performance capabilities including performance analysis, optimization, load testing, stress testing, capacity planning, and framework-specific performance patterns.”
- name
- performance
- author
- Joseph OBrien
- status
- unpublished
- updated
- 2025-12-23
- version
- 1.0.1
- tag
- skill
- type
- skill
Files
SKILL.md and 5 other files (references) in skills/89jobrien/performance of aiskillstore/marketplace.
- SKILL.md
- references/framework-patterns.md
- references/load-testing.md
- references/performance-analysis.template.md
- references/react-patterns.md
- skill-report.json
Open the folder on GitHubat commit 4ac52da
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in aiskillstore/marketplace, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Performance 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Performance this skillaiskillstore/marketplace | 430 | 1 repos | ~2.6k | Automated safety check: Pass | None | |
| Electron DevTools Trace Analysiskeybase/client | 9.3k | — | ~809 | Automated safety check: Pass | BSD-3-Clause | |
| React Best Practicesryokun6/ryos | 1.3k | — | ~2k | Automated safety check: Pass | MIT | |
| Vercel React Best Practicesgambitph/Stackable | 350 | — | ~2k | Automated safety check: Pass | MIT | |
| Performance Profileralirezarezvani/claude-skills | 28k | — | ~684 | Automated safety check: Pass | MIT | |
| React Best Practicespoteto/noodle | 420 | — | ~1.4k | Automated safety check: Pass | MIT |
Similar skills
React Best Practices
ryokun6/ryos
React performance optimization guidelines from Vercel Engineering (vercel-labs/agent-skills).
Vercel React Best Practices
gambitph/Stackable
React performance optimization guidelines from Vercel Engineering.
Performance Profiler
alirezarezvani/claude-skills
Systematic performance profiling for Node.js, Python, and Go applications.
React Best Practices
poteto/noodle
React performance optimization guidelines. An agent skill from poteto/noodle.
React
blencorp/claude-code-kit
Core React 19 patterns including hooks, Suspense, lazy loading, component structure, TypeScript best practices, and performance optimization.
More from aiskillstore/marketplace
All 1,085 skills in this repoCode Stats
aiskillstore/marketplace
Analyze codebase with tokei (fast line counts by language) and difft (semantic AST-aware diffs).
Data Processing
aiskillstore/marketplace
Process JSON with jq and YAML/TOML with yq. An agent skill from aiskillstore/marketplace.
Doc Scanner
aiskillstore/marketplace
Scans for project documentation files (AGENTS.md, CLAUDE.md, GEMINI.md, COPILOT.md, CURSOR.md, WARP.md, and 15+ other formats) and synthesizes guidance.
File Search
aiskillstore/marketplace
Modern file and content search using fd, ripgrep (rg), and fzf.
Find Replace
aiskillstore/marketplace
Modern find-and-replace using sd (simpler than sed) and batch replacement patterns.
Investigating Codebases
aiskillstore/marketplace
Automatically activated when user asks how something works, wants to understand unfamiliar code, needs to explore a new codebase, or asks questions like "where is X implemented?", "how does Y…
Related
Works with
Categories
Questions about Performance
What does Performance do?
Comprehensive performance specialist covering analysis, optimization, load testing, and framework-specific performance. Performance is an agent skill from aiskillstore/marketplace. Comprehensive performance specialist covering analysis, optimization, load testing, and framework-specific performance.
When should I use Performance?
Performance fits situations like: identifying bottlenecks; optimizing code; conducting load tests; analyzing Core Web Vitals.
How do I install Performance in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill performance -a claude-code`. Or copy the skill folder (skills/89jobrien/performance in aiskillstore/marketplace) into .claude/skills/performance in your project. Claude Code loads it when a task matches its description.
How do I install Performance in Codex?
Run `npx skills add aiskillstore/marketplace --skill performance -a codex`. Or copy the skill folder (skills/89jobrien/performance in aiskillstore/marketplace) into .agents/skills/performance in your project. Codex loads it when a task matches its description.
Can I use Performance 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 aiskillstore/marketplace --skill performance -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/performance, .gemini/skills/performance, .github/skills/performance and .opencode/skills/performance in your project.
What does Performance need to run?
SKILL.md names no scripts, command-line tools or credentials: Performance is instructions for the agent only. Our summary lists: Node.js.
Does Performance access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Performance 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 Performance use?
No licence was found for Performance or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Performance use?
About 2.6k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 6.6k tokens, read only when the agent opens those files.
What are the alternatives to Performance?
Skills that share tags, products or a category with Performance: Electron DevTools Trace Analysis (keybase/client, 9.3k stars), React Best Practices (ryokun6/ryos, 1.3k stars), Vercel React Best Practices (gambitph/Stackable, 350 stars) and Performance Profiler (alirezarezvani/claude-skills, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Performance?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,085 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.