What is react-performance?

A measurement-led approach to improving React and Next.js application performance while keeping behavior safe. It selects guidance for React rendering, component composition, or Next.js App Router features—the part of Next.js that handles application routes.

Use it to investigate and improve React or Next.js performance. It can direct work to guidance about React and Next.js rules, component API design, or App Router behavior.

It helps avoid performance changes based only on assumptions. Changes are measured, supported by evidence, and checked against the application's behavior.

react-performance — Skill for Claude Code and Codex by citypaul

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add citypaul/.dotfiles --skill react-performance

Clone the repo

git clone --depth 1 https://github.com/citypaul/.dotfiles

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/citypaul/.dotfiles/react-performance/github.svg)](https://agentmods.dev/skills/citypaul/.dotfiles/react-performance)

Your own site

<a href="https://agentmods.dev/skills/citypaul/.dotfiles/react-performance"><img src="https://agentmods.dev/badge/skills/citypaul/.dotfiles/react-performance/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/citypaul/.dotfiles/react-performance"><img src="https://agentmods.dev/badge/skills/citypaul/.dotfiles/react-performance.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 248 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,075 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00248	$0.02075
Opus 5.5	$0.00099	$0.00830
Sonnet 5.5	$0.00050	$0.00415
Haiku 4.5	$0.00025	$0.00208

Measured 2mo ago against content hash 19b5b5a26e42, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

react-performance scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

claude/.claude/skills/react-performance/SKILL.md · 93 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

agents/openai.yaml 350 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago Changed · +42 tokens per session 19b5b5a26e42
2mo ago First seen · 93 lines · 206 tokens per session scan A 378d1d343631

Subscribe to this mod's changes

react-performance is a skill published in the GitHub repository citypaul/.dotfiles (757 stars, last pushed 4d ago), with no licence file. It adds 248 tokens to every session and 2,075 once invoked, about $0.0010 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Frontend React

react-performance next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
react-performancecitypaul/.dotfiles	Skill	757	4d ago	none	A	248	Claude Code, Codex
build-ghost-appTryGhost/Ghost	Skill	56k	today	MIT	A	44	Claude Code, Codex
chakra-ui-builderchakra-ui/chakra-ui	Skill	41k	2d ago	MIT	A	214	Claude Code, Codex
material-ui-tailwindmui/material-ui	Skill	99k	yesterday	MIT	A	67	Claude Code, Codex
fuzzy-rankingTanStack/table	Skill	29k	5d ago	MIT	A	62	Claude Code, Codex
r3f-best-practiceszebbern/claude-code-guide	Skill	4.7k	yesterday	MIT	A	74	Claude Code, Codex
git-safetytamagui/tamagui	Skill	14k	yesterday	MIT	A	0	Claude Code