# benchmark

> Claude/Codex skill by [@garrytan](https://omgskills.com/library/garrytan/index.md) · 132k stars · Updated 2026-09-09

Performance regression detection. (gstack)

## Install

```sh
git clone https://github.com/garrytan/gstack /tmp/gstack && ln -s /tmp/gstack/benchmark ~/.claude/skills/benchmark
```

## From README

When to invoke this skill Establishes baselines for page load times, Core Web Vitals, and resource sizes. Compares before/after on every PR. Tracks performance trends over time. Use when: "performance", "benchmark", "page speed", "lighthouse", "web vitals", "bundle size", "load time". Voice triggers (speech-to-text aliases): "speed test", "check performance". Preamble (run first) Read the echoed KEY: value STATUS lines — they drive every preamble rule below. Degraded mode: if SKILLSTARTPROTO: 1 is missing from the output (script absent, stale , or a different protocol number), apply safe defaults: treat SESSIONKIND as interactive, do NOT assume Conductor, skip onboarding/telemetry steps (their gates are marker-based, so consent and onboarding prompts are DEFERRED to the next healthy run — never lost), tell the user to run ./ or /gstack-upgrade, and proceed with their task. Note SESSIONID and TELSTART from the output — the Telemetry step needs them at skill end.

## Links

- HTML page: https://omgskills.com/skills/garrytan/gstack/benchmark/
- GitHub: https://github.com/garrytan/gstack
- Author: [@garrytan](https://omgskills.com/library/garrytan/index.md)

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