{
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  "item": {
    "slug": "react-performance",
    "name": "React Performance",
    "source": "tencent",
    "type": "skill",
    "category": "开发工具",
    "sourceUrl": "https://clawhub.ai/wpank/react-performance",
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    "sourcePlatform": "tencent",
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    "extraction": "Extract archive",
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      "OpenClaw"
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      "README.md",
      "SKILL.md",
      "references/bundle-optimization.md",
      "references/async-patterns.md",
      "references/rerender-optimization.md",
      "references/server-components.md"
    ],
    "primaryDoc": "SKILL.md",
    "quickSetup": [
      "Download the package from Yavira.",
      "Extract the archive and review SKILL.md first.",
      "Import or place the package into your OpenClaw setup."
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      "summary": "Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.",
      "steps": [
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          "body": "I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Then review README.md for any prerequisites, environment setup, or post-install checks. Tell me what you changed and call out any manual steps you could not complete."
        },
        {
          "label": "Upgrade existing",
          "body": "I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Then review README.md for any prerequisites, environment setup, or post-install checks. Summarize what changed and any follow-up checks I should run."
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      "checkedAt": "2026-05-07T23:12:11.154Z",
      "expiresAt": "2026-05-14T23:12:11.154Z",
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      "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=react-performance",
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        "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=react-performance",
        "contentDisposition": "attachment; filename=\"react-performance-1.0.0.zip\"",
        "redirectLocation": null,
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        "slug": "react-performance"
      },
      "scope": "item",
      "summary": "Item download looks usable.",
      "detail": "Yavira can redirect you to the upstream package for this item.",
      "primaryActionLabel": "Download for OpenClaw",
      "primaryActionHref": "/downloads/react-performance"
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      "installChecklist": [
        "Use the Yavira download entry.",
        "Review SKILL.md after the package is downloaded.",
        "Confirm the extracted package contains the expected setup assets."
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        "Confirm the extracted package includes the expected docs or setup files.",
        "Validate the skill or prompts are available in your target agent workspace.",
        "Capture any manual follow-up steps the agent could not complete."
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    "briefUrl": "https://openagent3.xyz/skills/react-performance/agent.md"
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  "agentAssist": {
    "summary": "Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.",
    "steps": [
      "Download the package from Yavira.",
      "Extract it into a folder your agent can access.",
      "Paste one of the prompts below and point your agent at the extracted folder."
    ],
    "prompts": [
      {
        "label": "New install",
        "body": "I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Then review README.md for any prerequisites, environment setup, or post-install checks. Tell me what you changed and call out any manual steps you could not complete."
      },
      {
        "label": "Upgrade existing",
        "body": "I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Then review README.md for any prerequisites, environment setup, or post-install checks. Summarize what changed and any follow-up checks I should run."
      }
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  "documentation": {
    "source": "clawhub",
    "primaryDoc": "SKILL.md",
    "sections": [
      {
        "title": "React Performance Patterns",
        "body": "Performance optimization guide for React and Next.js applications. Patterns\nacross 7 categories, prioritized by impact. Detailed examples in references/."
      },
      {
        "title": "When to Apply",
        "body": "Writing new React components or Next.js pages\nImplementing data fetching (client or server-side)\nReviewing or refactoring for performance\nOptimizing bundle size or load times"
      },
      {
        "title": "Categories by Priority",
        "body": "#CategoryImpact1Async / WaterfallsCRITICAL2Bundle SizeCRITICAL3Server ComponentsHIGH4Re-rendersMEDIUM5RenderingMEDIUM6Client-Side DataMEDIUM7JS PerformanceLOW-MEDIUM"
      },
      {
        "title": "OpenClaw / Moltbot / Clawbot",
        "body": "npx clawhub@latest install react-performance"
      },
      {
        "title": "Parallelize independent operations",
        "body": "Sequential awaits are the single biggest performance mistake in React apps.\n\n// BAD — sequential, 3 round trips\nconst user = await fetchUser()\nconst posts = await fetchPosts()\nconst comments = await fetchComments()\n\n// GOOD — parallel, 1 round trip\nconst [user, posts, comments] = await Promise.all([\n  fetchUser(), fetchPosts(), fetchComments(),\n])"
      },
      {
        "title": "Defer await until needed",
        "body": "Move await into branches where the value is actually used.\n\n// BAD — blocks both branches\nasync function handle(userId: string, skip: boolean) {\n  const data = await fetchUserData(userId)\n  if (skip) return { skipped: true }    // Still waited\n  return process(data)\n}\n\n// GOOD — only blocks when needed\nasync function handle(userId: string, skip: boolean) {\n  if (skip) return { skipped: true }    // Returns immediately\n  return process(await fetchUserData(userId))\n}"
      },
      {
        "title": "Strategic Suspense boundaries",
        "body": "Show layout immediately while data-dependent sections load independently.\n\n// BAD — entire page blocked\nasync function Page() {\n  const data = await fetchData()\n  return <div><Sidebar /><Header /><DataDisplay data={data} /><Footer /></div>\n}\n\n// GOOD — layout renders immediately, data streams in\nfunction Page() {\n  return (\n    <div>\n      <Sidebar /><Header />\n      <Suspense fallback={<Skeleton />}><DataDisplay /></Suspense>\n      <Footer />\n    </div>\n  )\n}\nasync function DataDisplay() {\n  const data = await fetchData()\n  return <div>{data.content}</div>\n}\n\nShare a promise across components with use() to avoid duplicate fetches."
      },
      {
        "title": "Avoid barrel file imports",
        "body": "Barrel files load thousands of unused modules. Direct imports save 200-800ms.\n\n// BAD — loads 1,583 modules\nimport { Check, X, Menu } from 'lucide-react'\n\n// GOOD — loads only 3 modules\nimport Check from 'lucide-react/dist/esm/icons/check'\nimport X from 'lucide-react/dist/esm/icons/x'\nimport Menu from 'lucide-react/dist/esm/icons/menu'\n\nNext.js 13.5+: use experimental.optimizePackageImports in config.\nCommonly affected: lucide-react, @mui/material, react-icons, @radix-ui,\nlodash, date-fns."
      },
      {
        "title": "Dynamic imports for heavy components",
        "body": "import dynamic from 'next/dynamic'\nconst MonacoEditor = dynamic(\n  () => import('./monaco-editor').then((m) => m.MonacoEditor),\n  { ssr: false }\n)"
      },
      {
        "title": "Defer non-critical third-party libraries",
        "body": "Analytics, logging, error tracking — load after hydration with dynamic() and\n{ ssr: false }."
      },
      {
        "title": "Preload on user intent",
        "body": "const preload = () => { void import('./monaco-editor') }\n<button onMouseEnter={preload} onFocus={preload} onClick={onClick}>Open Editor</button>"
      },
      {
        "title": "Minimize serialization at RSC boundaries",
        "body": "Only pass fields the client actually uses across the server/client boundary.\n\n// BAD — serializes all 50 user fields\nreturn <Profile user={user} />\n\n// GOOD — serializes 1 field\nreturn <Profile name={user.name} />"
      },
      {
        "title": "Parallel data fetching with composition",
        "body": "RSC execute sequentially within a tree. Restructure to parallelize.\n\n// BAD — Sidebar waits for header fetch\nexport default async function Page() {\n  const header = await fetchHeader()\n  return <div><div>{header}</div><Sidebar /></div>\n}\n\n// GOOD — sibling async components fetch simultaneously\nasync function Header() { return <div>{await fetchHeader()}</div> }\nasync function Sidebar() { return <nav>{(await fetchSidebarItems()).map(renderItem)}</nav> }\nexport default function Page() { return <div><Header /><Sidebar /></div> }"
      },
      {
        "title": "React.cache() for per-request deduplication",
        "body": "import { cache } from 'react'\nexport const getCurrentUser = cache(async () => {\n  const session = await auth()\n  if (!session?.user?.id) return null\n  return await db.user.findUnique({ where: { id: session.user.id } })\n})\n\nUse primitive args (not inline objects) — React.cache() uses Object.is.\nNext.js auto-deduplicates fetch, but React.cache() is needed for DB queries,\nauth checks, and computations."
      },
      {
        "title": "after() for non-blocking operations",
        "body": "import { after } from 'next/server'\nexport async function POST(request: Request) {\n  await updateDatabase(request)\n  after(async () => { logUserAction({ userAgent: request.headers.get('user-agent') }) })\n  return Response.json({ status: 'success' })\n}"
      },
      {
        "title": "Derive state during render — not in effects",
        "body": "// BAD — redundant state + effect\nconst [fullName, setFullName] = useState('')\nuseEffect(() => { setFullName(first + ' ' + last) }, [first, last])\n\n// GOOD — derive inline\nconst fullName = first + ' ' + last"
      },
      {
        "title": "Functional setState for stable callbacks",
        "body": "// BAD — recreated on every items change\nconst addItem = useCallback((item: Item) => {\n  setItems([...items, item])\n}, [items])\n\n// GOOD — stable, always latest state\nconst addItem = useCallback((item: Item) => {\n  setItems((curr) => [...curr, item])\n}, [])"
      },
      {
        "title": "Defer state reads to usage point",
        "body": "Don't subscribe to dynamic state if you only read it in callbacks.\n\n// BAD — re-renders on every searchParams change\nconst searchParams = useSearchParams()\nconst handleShare = () => shareChat(chatId, { ref: searchParams.get('ref') })\n\n// GOOD — reads on demand\nconst handleShare = () => {\n  const ref = new URLSearchParams(window.location.search).get('ref')\n  shareChat(chatId, { ref })\n}"
      },
      {
        "title": "Lazy state initialization",
        "body": "// BAD — JSON.parse runs every render\nconst [settings] = useState(JSON.parse(localStorage.getItem('s') || '{}'))\n\n// GOOD — runs only once\nconst [settings] = useState(() => JSON.parse(localStorage.getItem('s') || '{}'))"
      },
      {
        "title": "Subscribe to derived booleans",
        "body": "// BAD — re-renders on every pixel\nconst width = useWindowWidth(); const isMobile = width < 768\n\n// GOOD — re-renders only when boolean flips\nconst isMobile = useMediaQuery('(max-width: 767px)')"
      },
      {
        "title": "Transitions for non-urgent updates",
        "body": "// BAD — blocks UI on scroll\nconst handler = () => setScrollY(window.scrollY)\n\n// GOOD — non-blocking\nconst handler = () => startTransition(() => setScrollY(window.scrollY))"
      },
      {
        "title": "Extract expensive work into memoized components",
        "body": "const UserAvatar = memo(function UserAvatar({ user }: { user: User }) {\n  const id = useMemo(() => computeAvatarId(user), [user])\n  return <Avatar id={id} />\n})\nfunction Profile({ user, loading }: Props) {\n  if (loading) return <Skeleton />\n  return <div><UserAvatar user={user} /></div>\n}\n\nNote: React Compiler makes manual memo()/useMemo() unnecessary."
      },
      {
        "title": "CSS content-visibility for long lists",
        "body": "For 1000 items, browser skips ~990 off-screen (10x faster initial render).\n\n.list-item { content-visibility: auto; contain-intrinsic-size: 0 80px; }"
      },
      {
        "title": "Hoist static JSX outside components",
        "body": "Avoids re-creation, especially for large SVG nodes. React Compiler does this\nautomatically.\n\nconst skeleton = <div className=\"skeleton\" />\nfunction Container() { return <div>{loading && skeleton}</div> }"
      },
      {
        "title": "SWR for deduplication and caching",
        "body": "// BAD — each instance fetches independently\nuseEffect(() => { fetch('/api/users').then(r => r.json()).then(setUsers) }, [])\n\n// GOOD — multiple instances share one request\nconst { data: users } = useSWR('/api/users', fetcher)"
      },
      {
        "title": "Set/Map for O(1) lookups",
        "body": "// BAD — O(n)\nitems.filter(i => allowed.includes(i.id))\n// GOOD — O(1)\nconst allowedSet = new Set(allowed)\nitems.filter(i => allowedSet.has(i.id))"
      },
      {
        "title": "Combine array iterations",
        "body": "// BAD — 3 passes\nconst a = users.filter(u => u.isAdmin)\nconst t = users.filter(u => u.isTester)\n// GOOD — 1 pass\nconst a: User[] = [], t: User[] = []\nfor (const u of users) { if (u.isAdmin) a.push(u); if (u.isTester) t.push(u) }\n\nAlso: early returns, cache property access in loops, hoist RegExp outside\nloops, prefer for...of for hot paths."
      },
      {
        "title": "Quick Decision Guide",
        "body": "Slow page load? → Bundle size (2), then async waterfalls (1)\nSluggish interactions? → Re-renders (4), then JS perf (7)\nServer page slow? → RSC serialization & parallel fetching (3)\nClient data stale/slow? → SWR (6)\nLong lists janky? → content-visibility (5)"
      }
    ],
    "body": "React Performance Patterns\n\nPerformance optimization guide for React and Next.js applications. Patterns across 7 categories, prioritized by impact. Detailed examples in references/.\n\nWhen to Apply\nWriting new React components or Next.js pages\nImplementing data fetching (client or server-side)\nReviewing or refactoring for performance\nOptimizing bundle size or load times\nCategories by Priority\n#\tCategory\tImpact\n1\tAsync / Waterfalls\tCRITICAL\n2\tBundle Size\tCRITICAL\n3\tServer Components\tHIGH\n4\tRe-renders\tMEDIUM\n5\tRendering\tMEDIUM\n6\tClient-Side Data\tMEDIUM\n7\tJS Performance\tLOW-MEDIUM\nInstallation\nOpenClaw / Moltbot / Clawbot\nnpx clawhub@latest install react-performance\n\n1. Async — Eliminating Waterfalls (CRITICAL)\nParallelize independent operations\n\nSequential awaits are the single biggest performance mistake in React apps.\n\n// BAD — sequential, 3 round trips\nconst user = await fetchUser()\nconst posts = await fetchPosts()\nconst comments = await fetchComments()\n\n// GOOD — parallel, 1 round trip\nconst [user, posts, comments] = await Promise.all([\n  fetchUser(), fetchPosts(), fetchComments(),\n])\n\nDefer await until needed\n\nMove await into branches where the value is actually used.\n\n// BAD — blocks both branches\nasync function handle(userId: string, skip: boolean) {\n  const data = await fetchUserData(userId)\n  if (skip) return { skipped: true }    // Still waited\n  return process(data)\n}\n\n// GOOD — only blocks when needed\nasync function handle(userId: string, skip: boolean) {\n  if (skip) return { skipped: true }    // Returns immediately\n  return process(await fetchUserData(userId))\n}\n\nStrategic Suspense boundaries\n\nShow layout immediately while data-dependent sections load independently.\n\n// BAD — entire page blocked\nasync function Page() {\n  const data = await fetchData()\n  return <div><Sidebar /><Header /><DataDisplay data={data} /><Footer /></div>\n}\n\n// GOOD — layout renders immediately, data streams in\nfunction Page() {\n  return (\n    <div>\n      <Sidebar /><Header />\n      <Suspense fallback={<Skeleton />}><DataDisplay /></Suspense>\n      <Footer />\n    </div>\n  )\n}\nasync function DataDisplay() {\n  const data = await fetchData()\n  return <div>{data.content}</div>\n}\n\n\nShare a promise across components with use() to avoid duplicate fetches.\n\n2. Bundle Size (CRITICAL)\nAvoid barrel file imports\n\nBarrel files load thousands of unused modules. Direct imports save 200-800ms.\n\n// BAD — loads 1,583 modules\nimport { Check, X, Menu } from 'lucide-react'\n\n// GOOD — loads only 3 modules\nimport Check from 'lucide-react/dist/esm/icons/check'\nimport X from 'lucide-react/dist/esm/icons/x'\nimport Menu from 'lucide-react/dist/esm/icons/menu'\n\n\nNext.js 13.5+: use experimental.optimizePackageImports in config. Commonly affected: lucide-react, @mui/material, react-icons, @radix-ui, lodash, date-fns.\n\nDynamic imports for heavy components\nimport dynamic from 'next/dynamic'\nconst MonacoEditor = dynamic(\n  () => import('./monaco-editor').then((m) => m.MonacoEditor),\n  { ssr: false }\n)\n\nDefer non-critical third-party libraries\n\nAnalytics, logging, error tracking — load after hydration with dynamic() and { ssr: false }.\n\nPreload on user intent\nconst preload = () => { void import('./monaco-editor') }\n<button onMouseEnter={preload} onFocus={preload} onClick={onClick}>Open Editor</button>\n\n3. Server Components (HIGH)\nMinimize serialization at RSC boundaries\n\nOnly pass fields the client actually uses across the server/client boundary.\n\n// BAD — serializes all 50 user fields\nreturn <Profile user={user} />\n\n// GOOD — serializes 1 field\nreturn <Profile name={user.name} />\n\nParallel data fetching with composition\n\nRSC execute sequentially within a tree. Restructure to parallelize.\n\n// BAD — Sidebar waits for header fetch\nexport default async function Page() {\n  const header = await fetchHeader()\n  return <div><div>{header}</div><Sidebar /></div>\n}\n\n// GOOD — sibling async components fetch simultaneously\nasync function Header() { return <div>{await fetchHeader()}</div> }\nasync function Sidebar() { return <nav>{(await fetchSidebarItems()).map(renderItem)}</nav> }\nexport default function Page() { return <div><Header /><Sidebar /></div> }\n\nReact.cache() for per-request deduplication\nimport { cache } from 'react'\nexport const getCurrentUser = cache(async () => {\n  const session = await auth()\n  if (!session?.user?.id) return null\n  return await db.user.findUnique({ where: { id: session.user.id } })\n})\n\n\nUse primitive args (not inline objects) — React.cache() uses Object.is. Next.js auto-deduplicates fetch, but React.cache() is needed for DB queries, auth checks, and computations.\n\nafter() for non-blocking operations\nimport { after } from 'next/server'\nexport async function POST(request: Request) {\n  await updateDatabase(request)\n  after(async () => { logUserAction({ userAgent: request.headers.get('user-agent') }) })\n  return Response.json({ status: 'success' })\n}\n\n4. Re-render Optimization (MEDIUM)\nDerive state during render — not in effects\n// BAD — redundant state + effect\nconst [fullName, setFullName] = useState('')\nuseEffect(() => { setFullName(first + ' ' + last) }, [first, last])\n\n// GOOD — derive inline\nconst fullName = first + ' ' + last\n\nFunctional setState for stable callbacks\n// BAD — recreated on every items change\nconst addItem = useCallback((item: Item) => {\n  setItems([...items, item])\n}, [items])\n\n// GOOD — stable, always latest state\nconst addItem = useCallback((item: Item) => {\n  setItems((curr) => [...curr, item])\n}, [])\n\nDefer state reads to usage point\n\nDon't subscribe to dynamic state if you only read it in callbacks.\n\n// BAD — re-renders on every searchParams change\nconst searchParams = useSearchParams()\nconst handleShare = () => shareChat(chatId, { ref: searchParams.get('ref') })\n\n// GOOD — reads on demand\nconst handleShare = () => {\n  const ref = new URLSearchParams(window.location.search).get('ref')\n  shareChat(chatId, { ref })\n}\n\nLazy state initialization\n// BAD — JSON.parse runs every render\nconst [settings] = useState(JSON.parse(localStorage.getItem('s') || '{}'))\n\n// GOOD — runs only once\nconst [settings] = useState(() => JSON.parse(localStorage.getItem('s') || '{}'))\n\nSubscribe to derived booleans\n// BAD — re-renders on every pixel\nconst width = useWindowWidth(); const isMobile = width < 768\n\n// GOOD — re-renders only when boolean flips\nconst isMobile = useMediaQuery('(max-width: 767px)')\n\nTransitions for non-urgent updates\n// BAD — blocks UI on scroll\nconst handler = () => setScrollY(window.scrollY)\n\n// GOOD — non-blocking\nconst handler = () => startTransition(() => setScrollY(window.scrollY))\n\nExtract expensive work into memoized components\nconst UserAvatar = memo(function UserAvatar({ user }: { user: User }) {\n  const id = useMemo(() => computeAvatarId(user), [user])\n  return <Avatar id={id} />\n})\nfunction Profile({ user, loading }: Props) {\n  if (loading) return <Skeleton />\n  return <div><UserAvatar user={user} /></div>\n}\n\n\nNote: React Compiler makes manual memo()/useMemo() unnecessary.\n\n5. Rendering Performance (MEDIUM)\nCSS content-visibility for long lists\n\nFor 1000 items, browser skips ~990 off-screen (10x faster initial render).\n\n.list-item { content-visibility: auto; contain-intrinsic-size: 0 80px; }\n\nHoist static JSX outside components\n\nAvoids re-creation, especially for large SVG nodes. React Compiler does this automatically.\n\nconst skeleton = <div className=\"skeleton\" />\nfunction Container() { return <div>{loading && skeleton}</div> }\n\n6. Client-Side Data (MEDIUM)\nSWR for deduplication and caching\n// BAD — each instance fetches independently\nuseEffect(() => { fetch('/api/users').then(r => r.json()).then(setUsers) }, [])\n\n// GOOD — multiple instances share one request\nconst { data: users } = useSWR('/api/users', fetcher)\n\n7. JS Performance (LOW-MEDIUM)\nSet/Map for O(1) lookups\n// BAD — O(n)\nitems.filter(i => allowed.includes(i.id))\n// GOOD — O(1)\nconst allowedSet = new Set(allowed)\nitems.filter(i => allowedSet.has(i.id))\n\nCombine array iterations\n// BAD — 3 passes\nconst a = users.filter(u => u.isAdmin)\nconst t = users.filter(u => u.isTester)\n// GOOD — 1 pass\nconst a: User[] = [], t: User[] = []\nfor (const u of users) { if (u.isAdmin) a.push(u); if (u.isTester) t.push(u) }\n\n\nAlso: early returns, cache property access in loops, hoist RegExp outside loops, prefer for...of for hot paths.\n\nQuick Decision Guide\nSlow page load? → Bundle size (2), then async waterfalls (1)\nSluggish interactions? → Re-renders (4), then JS perf (7)\nServer page slow? → RSC serialization & parallel fetching (3)\nClient data stale/slow? → SWR (6)\nLong lists janky? → content-visibility (5)"
  },
  "trust": {
    "sourceLabel": "tencent",
    "provenanceUrl": "https://clawhub.ai/wpank/react-performance",
    "publisherUrl": "https://clawhub.ai/wpank/react-performance",
    "owner": "wpank",
    "version": "1.0.0",
    "license": null,
    "verificationStatus": "Indexed source record"
  },
  "links": {
    "detailUrl": "https://openagent3.xyz/skills/react-performance",
    "downloadUrl": "https://openagent3.xyz/downloads/react-performance",
    "agentUrl": "https://openagent3.xyz/skills/react-performance/agent",
    "manifestUrl": "https://openagent3.xyz/skills/react-performance/agent.json",
    "briefUrl": "https://openagent3.xyz/skills/react-performance/agent.md"
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}