# Sandbox Bench

> Benchmark React or Next.js changes on Vercel Sandbox VMs with paired A/B statistics: react PR/com…

Benchmark React or Next.js changes on Vercel Sandbox VMs with paired A/B statistics: react PR/commit vs base, or Next.js PR/commit vs base, measured end-to-end through the bench/render-pipeline app (rps, latency, p95; TTFB, RSS and document/Flight bytes when the Next side captures them) and, for React changes, through the react repo's flight-ssr-bench fixture (Node AND Edge web-streams paths, Fizz and Flight+Fizz). Use whenever the user asks to bench, perf test, or A/B a React PR, a react-server-dom / Flight / vendored React change, or a Next.js PR ("is this PR faster", "does this regress RSC?", "measure the perf impact of <commit>"), even if they don't say "benchmark" — any request to quantify a server-side performance difference between two revisions belongs here. Runs remotely (laptop-free), applies correctness gates before measuring, and reports boot-level confidence intervals.

- Page: https://ss33.ai/skills/vercel/sandbox-bench-52187184573
- Publisher: vercel
- Category: [Software Development](https://ss33.ai/skills/category/software-development-t44z8z) › [Testing & QA](https://ss33.ai/skills/category/software-development-t44z8z/testing-and-qa-g56s6z)
- Source: https://github.com/vercel/next.js/blob/ef0bc5f39a8e7bc9169830bd8b4391c69f5a44b5/.agents/skills/sandbox-bench/SKILL.md

## Skill

This skill's licence does not allow redistribution, so the store does not serve its text. Get it from the author: https://github.com/vercel/next.js/blob/ef0bc5f39a8e7bc9169830bd8b4391c69f5a44b5/.agents/skills/sandbox-bench/SKILL.md