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Agent skill

React Performance

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Optimize React rendering, bundle size, and data flow with profiler-led decisions.

MITAuto-check passedDevelopment

Install React Performance

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill react-performance -a claude-code

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

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard react-performance --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/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/react/react-performance .claude/skills/react-performance && 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/

Facts

Skill name
react-performance
GitHub stars
572
Token cost
~577 tokens
SKILL.md length
233 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Optimize React rendering, bundle size, and data flow with profiler-led decisions.

  • Works in 4 steps: Find the hotspot: profiler flamegraph,… → Pick the narrow fix: state placement,… → Retest after change: confirm the render… → …
  • Reducing re-renders
  • SKILL.md covers Priority: P0 (CRITICAL), Decision Map, Recipe and Verify, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

React Performance is an agent skill from HoangNguyen0403/agent-skills-standard. Optimize React rendering, bundle size, and data flow with profiler-led decisions. Use when reducing re-renders, fixing waterfalls, or deciding whether memoization is warranted in React.

Its SKILL.md is about 580 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/REFERENCE.md`).

It sits in Development, covering Performance optimization and Web performance. It works with React. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Reducing re-renders
  • Fixing waterfalls
  • Deciding whether memoization is warranted in React

Example prompts

  • “/react-performance”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Find the hotspot: profiler flamegraph, bundle analyzer, or waterfall trace.
  2. Pick the narrow fix: state placement, context split, transition, lazy load, or memoization.
  3. Retest after change: confirm the render count or blocking time actually improved.
  4. Keep slow work off the main path: workers for heavy compute, streaming for slow I/O.

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. 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.

    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

React Performance loads about 577 tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 51 tokens; SKILL.md has 233 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~577
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.4k

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 HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 233 words, ~577 tokens.

Download SKILL.mdSave it as .claude/skills/react-performance/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
react-performance
description
Optimize React rendering, bundle size, and data flow with profiler-led decisions. Use when reducing re-renders, fixing waterfalls, or deciding whether memoization is warranted in React.

React Performance

Priority: P0 (CRITICAL)

Decision Map

  • Measure first: use React DevTools Profiler or app-level traces before adding memoization.
  • Waterfalls: parallelize independent reads with Promise.all and stream slow branches behind Suspense.
  • Rerenders: move state down, split context, and memoize only measured hot paths.
  • Bundle cost: lazy-load heavy islands, remove oversized dependencies, and avoid barrel files that fight tree-shaking.
  • Compiler-aware: if React Compiler is enabled, do not scatter useCallback/useMemo by reflex.

Recipe

  1. Find the hotspot: profiler flamegraph, bundle analyzer, or waterfall trace.
  2. Pick the narrow fix: state placement, context split, transition, lazy load, or memoization.
  3. Retest after change: confirm the render count or blocking time actually improved.
  4. Keep slow work off the main path: workers for heavy compute, streaming for slow I/O.

Verify

  • Independent reads are parallel, not sequential.
  • Effects are not driving derived state loops.
  • Memoization exists because of a measured hotspot or memoized child boundary.
  • Large lists are virtualized when needed.
  • Heavy client code is split behind lazy or route-level boundaries.

Anti-Patterns

  • No export *: Breaks tree-shaking.
  • No Sequential Await: Causes waterfalls.
  • No memo by superstition: profile before adding useMemo / useCallback.
  • No effect-driven derived state: compute during render unless syncing external systems.
  • No Heavy Libs: Avoid oversized dependencies when smaller choices exist.

References

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • Split Context

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/react/react-performance of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/REFERENCE.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

React 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.

React Performance compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
React Performance this skillHoangNguyen0403/agent-skills-standard572—~577Automated safety check: PassMIT
Electron DevTools Trace Analysiskeybase/client9.3k—~809Automated safety check: PassBSD-3-Clause
React Performanceaffaan-m/ECC276k1 repos~4.5kAutomated safety check: PassMIT
React Best Practicesryokun6/ryos1.3k—~2kAutomated safety check: PassMIT
Vercel React Best Practicesgambitph/Stackable351—~2kAutomated safety check: PassMIT
Nextjs React ExpertDokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI508—~1.7kAutomated safety check: PassCustom licence

Similar skills

  • Electron DevTools Trace Analysis

    keybase/client

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    9.3k GitHub stars~809 tokensUpdated yesterday
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  • React Performance

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    React and Next.js performance optimization patterns adapted from Vercel Engineering's React Best Practices (https://github.com/vercel-labs/agent-skills).

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    React performance optimization guidelines from Vercel Engineering.

    351 GitHub stars~2k tokensUpdated 3 days ago
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  • Nextjs React Expert

    Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI

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Works with

Categories

Questions about React Performance

What does React Performance do?

Optimize React rendering, bundle size, and data flow with profiler-led decisions. React Performance is an agent skill from HoangNguyen0403/agent-skills-standard. Optimize React rendering, bundle size, and data flow with profiler-led decisions.

When should I use React Performance?

React Performance fits situations like: reducing re-renders; fixing waterfalls; deciding whether memoization is warranted in React.

How do I install React Performance in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill react-performance -a claude-code`. Or copy the skill folder (skills/react/react-performance in HoangNguyen0403/agent-skills-standard) into .claude/skills/react-performance in your project. Claude Code loads it when a task matches its description.

How do I install React Performance in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill react-performance -a codex`. Or copy the skill folder (skills/react/react-performance in HoangNguyen0403/agent-skills-standard) into .agents/skills/react-performance in your project. Codex loads it when a task matches its description.

Can I use React 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 HoangNguyen0403/agent-skills-standard --skill react-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/react-performance, .gemini/skills/react-performance, .github/skills/react-performance and .opencode/skills/react-performance in your project.

What does React Performance need to run?

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

Does React 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 React 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 React Performance use?

React Performance is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does React Performance use?

About 577 tokens (SKILL.md is roughly 2.3k 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 814 tokens, read only when the agent opens those files.

What are the alternatives to React Performance?

Skills that share tags, products or a category with React Performance: Electron DevTools Trace Analysis (keybase/client, 9.3k stars), React Performance (affaan-m/ECC, 276k stars), React Best Practices (ryokun6/ryos, 1.3k stars) and Vercel React Best Practices (gambitph/Stackable, 351 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains React Performance?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.