[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill:01M73ZPNT5WC2K8SYBD9DGAK9R":3,"skill-same:01M73ZPNT5WC2K8SYBD9DGAK9R":58},{"skillNo":4,"name":5,"nameZh":6,"description":7,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":16,"categories":17,"keywords":18,"publishedAt":19,"linkOnly":20,"markdownContent":21,"markdownBody":22,"frontMatter":23,"refName":28,"commitSha":29,"skillDirectory":30,"forksCount":31,"repositoryHtmlUrl":32,"repositoryHomepageUrl":33,"ownerHtmlUrl":34,"ownerBlogUrl":35,"ownerDescription":36,"updatedAt":37,"install":38,"resources":51},"01M73ZPNT5WC2K8SYBD9DGAK9R","performance-vitals",null,"Enforce Core Web Vitals optimization. Use when building user-facing features, reviewing performance, or when Lighthouse scores drop. Covers LCP, FID\u002FINP, CLS, and optimization techniques.","bg-szy\u002FTOP-SKILLS","bg-szy","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F106576190?v=4","01M73A4E8KPV67SFXRY8XZGNBX","ShuZhiyong","01M73A4E96MQ294MHM74TZBVQD",6,"MIT","https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Fperformance-vitals\u002FSKILL.md",[],[],"2026-11-11 15:11:14",false,"---\nname: performance-vitals\ndescription: Enforce Core Web Vitals optimization. Use when building user-facing features, reviewing performance, or when Lighthouse scores drop. Covers LCP, FID\u002FINP, CLS, and optimization techniques.\nallowed-tools: Read, Glob, Grep, Edit, Write, Bash\nlicense: MIT\nmetadata:\n  author: antigravity-team\n  version: \"1.0\"\n---\n\n# Performance & Core Web Vitals\n\nCore Web Vitals 최적화를 강제하는 스킬입니다.\n\n## 2025 Context\n\n> **2024년 3월: INP(Interaction to Next Paint)가 FID를 대체**\n> **Google Search 랭킹에 Core Web Vitals 영향**\n\n## Core Web Vitals 목표\n\n| 지표 | Good | Needs Improvement | Poor |\n|------|------|-------------------|------|\n| **LCP** (Largest Contentful Paint) | ≤ 2.5s | 2.5s - 4s | > 4s |\n| **INP** (Interaction to Next Paint) | ≤ 200ms | 200ms - 500ms | > 500ms |\n| **CLS** (Cumulative Layout Shift) | ≤ 0.1 | 0.1 - 0.25 | > 0.25 |\n\n## LCP 최적화 (Largest Contentful Paint)\n\n### 문제 원인\n\n- 느린 서버 응답\n- 렌더 차단 리소스 (CSS, JS)\n- 느린 리소스 로딩\n- 클라이언트 사이드 렌더링\n\n### 해결 방법\n\n#### 1. 이미지 최적화\n\n```tsx\n\u002F\u002F ❌ BAD: 최적화 없는 이미지\n\u003Cimg src=\"\u002Fhero.jpg\" alt=\"Hero\" \u002F>\n\n\u002F\u002F ✅ GOOD: Next.js Image 컴포넌트\nimport Image from 'next\u002Fimage';\n\n\u003CImage\n  src=\"\u002Fhero.jpg\"\n  alt=\"Hero\"\n  width={1200}\n  height={600}\n  priority  \u002F\u002F LCP 이미지는 priority 추가\n  placeholder=\"blur\"\n  blurDataURL={blurDataUrl}\n\u002F>\n```\n\n#### 2. 폰트 최적화\n\n```tsx\n\u002F\u002F ✅ GOOD: Next.js 폰트 최적화\nimport { Inter } from 'next\u002Ffont\u002Fgoogle';\n\nconst inter = Inter({\n  subsets: ['latin'],\n  display: 'swap',  \u002F\u002F FOIT 방지\n  preload: true,\n});\n\n\u002F\u002F CSS\n@font-face {\n  font-family: 'Custom Font';\n  src: url('\u002Ffonts\u002Fcustom.woff2') format('woff2');\n  font-display: swap;\n}\n```\n\n#### 3. Critical CSS 인라인\n\n```tsx\n\u002F\u002F next.config.js\nmodule.exports = {\n  experimental: {\n    optimizeCss: true,\n  },\n};\n```\n\n#### 4. 프리로드\n\n```html\n\u003C!-- 중요 리소스 프리로드 -->\n\u003Clink rel=\"preload\" href=\"\u002Fhero.jpg\" as=\"image\" \u002F>\n\u003Clink rel=\"preload\" href=\"\u002Ffonts\u002Fmain.woff2\" as=\"font\" crossorigin \u002F>\n\u003Clink rel=\"preconnect\" href=\"https:\u002F\u002Fapi.example.com\" \u002F>\n```\n\n## INP 최적화 (Interaction to Next Paint)\n\n### 문제 원인\n\n- 긴 JavaScript 태스크\n- 과도한 DOM 크기\n- 비효율적인 이벤트 핸들러\n\n### 해결 방법\n\n#### 1. 긴 태스크 분할\n\n```typescript\n\u002F\u002F ❌ BAD: 긴 동기 작업\nfunction processLargeData(items: Item[]) {\n  items.forEach(item => {\n    heavyComputation(item);  \u002F\u002F 메인 스레드 블로킹\n  });\n}\n\n\u002F\u002F ✅ GOOD: 청크 분할 + yield\nasync function processLargeData(items: Item[]) {\n  const CHUNK_SIZE = 100;\n\n  for (let i = 0; i \u003C items.length; i += CHUNK_SIZE) {\n    const chunk = items.slice(i, i + CHUNK_SIZE);\n    chunk.forEach(item => heavyComputation(item));\n\n    \u002F\u002F 브라우저에 제어권 반환\n    await new Promise(resolve => setTimeout(resolve, 0));\n  }\n}\n```\n\n#### 2. 이벤트 핸들러 최적화\n\n```tsx\n\u002F\u002F ❌ BAD: 무거운 핸들러\n\u003Cinput onChange={(e) => {\n  const value = e.target.value;\n  validateAllFields();  \u002F\u002F 무거운 연산\n  updateUI();\n  sendAnalytics();\n}} \u002F>\n\n\u002F\u002F ✅ GOOD: 디바운스 + 분리\nimport { useDeferredValue, useTransition } from 'react';\n\nfunction SearchInput() {\n  const [input, setInput] = useState('');\n  const deferredInput = useDeferredValue(input);\n  const [isPending, startTransition] = useTransition();\n\n  const handleChange = (e: ChangeEvent\u003CHTMLInputElement>) => {\n    setInput(e.target.value);  \u002F\u002F 즉시 업데이트\n\n    startTransition(() => {\n      \u002F\u002F 덜 급한 업데이트는 transition으로\n      performSearch(e.target.value);\n    });\n  };\n\n  return \u003Cinput value={input} onChange={handleChange} \u002F>;\n}\n```\n\n#### 3. Web Worker 활용\n\n```typescript\n\u002F\u002F worker.ts\nself.onmessage = (e) => {\n  const result = heavyComputation(e.data);\n  self.postMessage(result);\n};\n\n\u002F\u002F main.ts\nconst worker = new Worker(new URL('.\u002Fworker.ts', import.meta.url));\n\nworker.postMessage(data);\nworker.onmessage = (e) => {\n  setResult(e.data);\n};\n```\n\n## CLS 최적화 (Cumulative Layout Shift)\n\n### 문제 원인\n\n- 크기 미지정 이미지\u002F비디오\n- 동적 콘텐츠 삽입\n- 웹폰트 FOIT\u002FFOUT\n- 애니메이션\n\n### 해결 방법\n\n#### 1. 이미지\u002F비디오 크기 지정\n\n```tsx\n\u002F\u002F ❌ BAD: 크기 미지정\n\u003Cimg src=\"\u002Fphoto.jpg\" alt=\"Photo\" \u002F>\n\n\u002F\u002F ✅ GOOD: 크기 명시\n\u003Cimg\n  src=\"\u002Fphoto.jpg\"\n  alt=\"Photo\"\n  width={800}\n  height={600}\n\u002F>\n\n\u002F\u002F ✅ GOOD: aspect-ratio 사용\n\u003Cdiv style={{ aspectRatio: '16\u002F9' }}>\n  \u003Cimg src=\"\u002Fvideo-thumb.jpg\" alt=\"Video\" style={{ width: '100%' }} \u002F>\n\u003C\u002Fdiv>\n```\n\n#### 2. 동적 콘텐츠 공간 확보\n\n```tsx\n\u002F\u002F ❌ BAD: 공간 없이 동적 삽입\n{isLoaded && \u003CBanner \u002F>}\n\n\u002F\u002F ✅ GOOD: 스켈레톤으로 공간 확보\n{isLoaded ? \u003CBanner \u002F> : \u003CBannerSkeleton \u002F>}\n\n\u002F\u002F ✅ GOOD: min-height로 공간 확보\n\u003Cdiv style={{ minHeight: '200px' }}>\n  {isLoaded && \u003CDynamicContent \u002F>}\n\u003C\u002Fdiv>\n```\n\n#### 3. 폰트 로딩\n\n```css\n\u002F* ✅ GOOD: font-display: swap *\u002F\n@font-face {\n  font-family: 'CustomFont';\n  src: url('\u002Ffont.woff2') format('woff2');\n  font-display: swap;\n}\n\n\u002F* ✅ GOOD: 폴백 폰트 크기 조정 *\u002F\n@font-face {\n  font-family: 'CustomFont';\n  src: url('\u002Ffont.woff2') format('woff2');\n  font-display: swap;\n  size-adjust: 105%;  \u002F* 폴백 폰트와 크기 맞춤 *\u002F\n}\n```\n\n#### 4. 애니메이션\n\n```css\n\u002F* ❌ BAD: 레이아웃 속성 애니메이션 *\u002F\n.animate {\n  transition: width 0.3s, height 0.3s, margin 0.3s;\n}\n\n\u002F* ✅ GOOD: transform, opacity만 사용 *\u002F\n.animate {\n  transition: transform 0.3s, opacity 0.3s;\n}\n```\n\n## 측정 도구\n\n### Lighthouse CI\n\n```yaml\n# .github\u002Fworkflows\u002Flighthouse.yml\nname: Lighthouse CI\n\non: [push]\n\njobs:\n  lighthouse:\n    runs-on: ubuntu-latest\n    steps:\n      - uses: actions\u002Fcheckout@v4\n\n      - name: Run Lighthouse CI\n        uses: treosh\u002Flighthouse-ci-action@v10\n        with:\n          urls: |\n            https:\u002F\u002Fexample.com\u002F\n            https:\u002F\u002Fexample.com\u002Fdashboard\n          budgetPath: .\u002Flighthouse-budget.json\n          uploadArtifacts: true\n```\n\n### lighthouse-budget.json\n\n```json\n[\n  {\n    \"path\": \"\u002F*\",\n    \"timings\": [\n      { \"metric\": \"largest-contentful-paint\", \"budget\": 2500 },\n      { \"metric\": \"cumulative-layout-shift\", \"budget\": 0.1 },\n      { \"metric\": \"interaction-to-next-paint\", \"budget\": 200 }\n    ]\n  }\n]\n```\n\n### web-vitals 라이브러리\n\n```tsx\nimport { onCLS, onINP, onLCP } from 'web-vitals';\n\nfunction sendToAnalytics(metric: Metric) {\n  console.log(metric.name, metric.value);\n\n  \u002F\u002F Analytics 전송\n  gtag('event', metric.name, {\n    value: metric.delta,\n    metric_id: metric.id,\n    metric_value: metric.value,\n    metric_delta: metric.delta,\n  });\n}\n\nonCLS(sendToAnalytics);\nonINP(sendToAnalytics);\nonLCP(sendToAnalytics);\n```\n\n## 빠른 최적화 체크리스트\n\n### LCP 개선\n\n- [ ] LCP 이미지에 `priority` 또는 `preload`\n- [ ] 이미지 포맷 최적화 (WebP\u002FAVIF)\n- [ ] 서버 응답 시간 \u003C 600ms\n- [ ] Critical CSS 인라인\n- [ ] 렌더 차단 리소스 제거\n\n### INP 개선\n\n- [ ] Long Task > 50ms 제거\n- [ ] 이벤트 핸들러 최적화\n- [ ] 무거운 연산 Web Worker로 이동\n- [ ] `useTransition`, `useDeferredValue` 활용\n- [ ] Third-party 스크립트 지연 로딩\n\n### CLS 개선\n\n- [ ] 모든 이미지\u002F비디오 크기 지정\n- [ ] 동적 콘텐츠 공간 확보 (스켈레톤)\n- [ ] `font-display: swap` 설정\n- [ ] transform\u002Fopacity만 애니메이션\n\n## Workflow\n\n### 1. 성능 측정\n\n```bash\n# Lighthouse CLI\nnpx lighthouse https:\u002F\u002Fexample.com --output=json --output-path=.\u002Flh-report.json\n\n# 또는 Chrome DevTools > Lighthouse 탭\n```\n\n### 2. 문제 진단\n\n```\nLCP > 2.5s?\n→ Network 탭에서 LCP 리소스 확인\n→ 이미지 최적화 \u002F 프리로드 적용\n\nINP > 200ms?\n→ Performance 탭에서 Long Task 확인\n→ 태스크 분할 \u002F Web Worker 적용\n\nCLS > 0.1?\n→ Layout Shift 원인 요소 확인\n→ 크기 지정 \u002F 스켈레톤 적용\n```\n\n### 3. 모니터링\n\n```\n프로덕션:\n- Google Search Console Core Web Vitals\n- Real User Monitoring (RUM)\n- web-vitals 라이브러리\n\nCI\u002FCD:\n- Lighthouse CI\n- Performance Budget 설정\n```\n\n## References\n\n- [web.dev Core Web Vitals](https:\u002F\u002Fweb.dev\u002Fvitals\u002F)\n- [Lighthouse](https:\u002F\u002Fdeveloper.chrome.com\u002Fdocs\u002Flighthouse\u002F)\n- [web-vitals library](https:\u002F\u002Fgithub.com\u002FGoogleChrome\u002Fweb-vitals)\n","# Performance & Core Web Vitals\n\nCore Web Vitals 최적화를 강제하는 스킬입니다.\n\n## 2025 Context\n\n> **2024년 3월: INP(Interaction to Next Paint)가 FID를 대체**\n> **Google Search 랭킹에 Core Web Vitals 영향**\n\n## Core Web Vitals 목표\n\n| 지표 | Good | Needs Improvement | Poor |\n|------|------|-------------------|------|\n| **LCP** (Largest Contentful Paint) | ≤ 2.5s | 2.5s - 4s | > 4s |\n| **INP** (Interaction to Next Paint) | ≤ 200ms | 200ms - 500ms | > 500ms |\n| **CLS** (Cumulative Layout Shift) | ≤ 0.1 | 0.1 - 0.25 | > 0.25 |\n\n## LCP 최적화 (Largest Contentful Paint)\n\n### 문제 원인\n\n- 느린 서버 응답\n- 렌더 차단 리소스 (CSS, JS)\n- 느린 리소스 로딩\n- 클라이언트 사이드 렌더링\n\n### 해결 방법\n\n#### 1. 이미지 최적화\n\n```tsx\n\u002F\u002F ❌ BAD: 최적화 없는 이미지\n\u003Cimg src=\"\u002Fhero.jpg\" alt=\"Hero\" \u002F>\n\n\u002F\u002F ✅ GOOD: Next.js Image 컴포넌트\nimport Image from 'next\u002Fimage';\n\n\u003CImage\n  src=\"\u002Fhero.jpg\"\n  alt=\"Hero\"\n  width={1200}\n  height={600}\n  priority  \u002F\u002F LCP 이미지는 priority 추가\n  placeholder=\"blur\"\n  blurDataURL={blurDataUrl}\n\u002F>\n```\n\n#### 2. 폰트 최적화\n\n```tsx\n\u002F\u002F ✅ GOOD: Next.js 폰트 최적화\nimport { Inter } from 'next\u002Ffont\u002Fgoogle';\n\nconst inter = Inter({\n  subsets: ['latin'],\n  display: 'swap',  \u002F\u002F FOIT 방지\n  preload: true,\n});\n\n\u002F\u002F CSS\n@font-face {\n  font-family: 'Custom Font';\n  src: url('\u002Ffonts\u002Fcustom.woff2') format('woff2');\n  font-display: swap;\n}\n```\n\n#### 3. Critical CSS 인라인\n\n```tsx\n\u002F\u002F next.config.js\nmodule.exports = {\n  experimental: {\n    optimizeCss: true,\n  },\n};\n```\n\n#### 4. 프리로드\n\n```html\n\u003C!-- 중요 리소스 프리로드 -->\n\u003Clink rel=\"preload\" href=\"\u002Fhero.jpg\" as=\"image\" \u002F>\n\u003Clink rel=\"preload\" href=\"\u002Ffonts\u002Fmain.woff2\" as=\"font\" crossorigin \u002F>\n\u003Clink rel=\"preconnect\" href=\"https:\u002F\u002Fapi.example.com\" \u002F>\n```\n\n## INP 최적화 (Interaction to Next Paint)\n\n### 문제 원인\n\n- 긴 JavaScript 태스크\n- 과도한 DOM 크기\n- 비효율적인 이벤트 핸들러\n\n### 해결 방법\n\n#### 1. 긴 태스크 분할\n\n```typescript\n\u002F\u002F ❌ BAD: 긴 동기 작업\nfunction processLargeData(items: Item[]) {\n  items.forEach(item => {\n    heavyComputation(item);  \u002F\u002F 메인 스레드 블로킹\n  });\n}\n\n\u002F\u002F ✅ GOOD: 청크 분할 + yield\nasync function processLargeData(items: Item[]) {\n  const CHUNK_SIZE = 100;\n\n  for (let i = 0; i \u003C items.length; i += CHUNK_SIZE) {\n    const chunk = items.slice(i, i + CHUNK_SIZE);\n    chunk.forEach(item => heavyComputation(item));\n\n    \u002F\u002F 브라우저에 제어권 반환\n    await new Promise(resolve => setTimeout(resolve, 0));\n  }\n}\n```\n\n#### 2. 이벤트 핸들러 최적화\n\n```tsx\n\u002F\u002F ❌ BAD: 무거운 핸들러\n\u003Cinput onChange={(e) => {\n  const value = e.target.value;\n  validateAllFields();  \u002F\u002F 무거운 연산\n  updateUI();\n  sendAnalytics();\n}} \u002F>\n\n\u002F\u002F ✅ GOOD: 디바운스 + 분리\nimport { useDeferredValue, useTransition } from 'react';\n\nfunction SearchInput() {\n  const [input, setInput] = useState('');\n  const deferredInput = useDeferredValue(input);\n  const [isPending, startTransition] = useTransition();\n\n  const handleChange = (e: ChangeEvent\u003CHTMLInputElement>) => {\n    setInput(e.target.value);  \u002F\u002F 즉시 업데이트\n\n    startTransition(() => {\n      \u002F\u002F 덜 급한 업데이트는 transition으로\n      performSearch(e.target.value);\n    });\n  };\n\n  return \u003Cinput value={input} onChange={handleChange} \u002F>;\n}\n```\n\n#### 3. Web Worker 활용\n\n```typescript\n\u002F\u002F worker.ts\nself.onmessage = (e) => {\n  const result = heavyComputation(e.data);\n  self.postMessage(result);\n};\n\n\u002F\u002F main.ts\nconst worker = new Worker(new URL('.\u002Fworker.ts', import.meta.url));\n\nworker.postMessage(data);\nworker.onmessage = (e) => {\n  setResult(e.data);\n};\n```\n\n## CLS 최적화 (Cumulative Layout Shift)\n\n### 문제 원인\n\n- 크기 미지정 이미지\u002F비디오\n- 동적 콘텐츠 삽입\n- 웹폰트 FOIT\u002FFOUT\n- 애니메이션\n\n### 해결 방법\n\n#### 1. 이미지\u002F비디오 크기 지정\n\n```tsx\n\u002F\u002F ❌ BAD: 크기 미지정\n\u003Cimg src=\"\u002Fphoto.jpg\" alt=\"Photo\" \u002F>\n\n\u002F\u002F ✅ GOOD: 크기 명시\n\u003Cimg\n  src=\"\u002Fphoto.jpg\"\n  alt=\"Photo\"\n  width={800}\n  height={600}\n\u002F>\n\n\u002F\u002F ✅ GOOD: aspect-ratio 사용\n\u003Cdiv style={{ aspectRatio: '16\u002F9' }}>\n  \u003Cimg src=\"\u002Fvideo-thumb.jpg\" alt=\"Video\" style={{ width: '100%' }} \u002F>\n\u003C\u002Fdiv>\n```\n\n#### 2. 동적 콘텐츠 공간 확보\n\n```tsx\n\u002F\u002F ❌ BAD: 공간 없이 동적 삽입\n{isLoaded && \u003CBanner \u002F>}\n\n\u002F\u002F ✅ GOOD: 스켈레톤으로 공간 확보\n{isLoaded ? \u003CBanner \u002F> : \u003CBannerSkeleton \u002F>}\n\n\u002F\u002F ✅ GOOD: min-height로 공간 확보\n\u003Cdiv style={{ minHeight: '200px' }}>\n  {isLoaded && \u003CDynamicContent \u002F>}\n\u003C\u002Fdiv>\n```\n\n#### 3. 폰트 로딩\n\n```css\n\u002F* ✅ GOOD: font-display: swap *\u002F\n@font-face {\n  font-family: 'CustomFont';\n  src: url('\u002Ffont.woff2') format('woff2');\n  font-display: swap;\n}\n\n\u002F* ✅ GOOD: 폴백 폰트 크기 조정 *\u002F\n@font-face {\n  font-family: 'CustomFont';\n  src: url('\u002Ffont.woff2') format('woff2');\n  font-display: swap;\n  size-adjust: 105%;  \u002F* 폴백 폰트와 크기 맞춤 *\u002F\n}\n```\n\n#### 4. 애니메이션\n\n```css\n\u002F* ❌ BAD: 레이아웃 속성 애니메이션 *\u002F\n.animate {\n  transition: width 0.3s, height 0.3s, margin 0.3s;\n}\n\n\u002F* ✅ GOOD: transform, opacity만 사용 *\u002F\n.animate {\n  transition: transform 0.3s, opacity 0.3s;\n}\n```\n\n## 측정 도구\n\n### Lighthouse CI\n\n```yaml\n# .github\u002Fworkflows\u002Flighthouse.yml\nname: Lighthouse CI\n\non: [push]\n\njobs:\n  lighthouse:\n    runs-on: ubuntu-latest\n    steps:\n      - uses: actions\u002Fcheckout@v4\n\n      - name: Run Lighthouse CI\n        uses: treosh\u002Flighthouse-ci-action@v10\n        with:\n          urls: |\n            https:\u002F\u002Fexample.com\u002F\n            https:\u002F\u002Fexample.com\u002Fdashboard\n          budgetPath: .\u002Flighthouse-budget.json\n          uploadArtifacts: true\n```\n\n### lighthouse-budget.json\n\n```json\n[\n  {\n    \"path\": \"\u002F*\",\n    \"timings\": [\n      { \"metric\": \"largest-contentful-paint\", \"budget\": 2500 },\n      { \"metric\": \"cumulative-layout-shift\", \"budget\": 0.1 },\n      { \"metric\": \"interaction-to-next-paint\", \"budget\": 200 }\n    ]\n  }\n]\n```\n\n### web-vitals 라이브러리\n\n```tsx\nimport { onCLS, onINP, onLCP } from 'web-vitals';\n\nfunction sendToAnalytics(metric: Metric) {\n  console.log(metric.name, metric.value);\n\n  \u002F\u002F Analytics 전송\n  gtag('event', metric.name, {\n    value: metric.delta,\n    metric_id: metric.id,\n    metric_value: metric.value,\n    metric_delta: metric.delta,\n  });\n}\n\nonCLS(sendToAnalytics);\nonINP(sendToAnalytics);\nonLCP(sendToAnalytics);\n```\n\n## 빠른 최적화 체크리스트\n\n### LCP 개선\n\n- [ ] LCP 이미지에 `priority` 또는 `preload`\n- [ ] 이미지 포맷 최적화 (WebP\u002FAVIF)\n- [ ] 서버 응답 시간 \u003C 600ms\n- [ ] Critical CSS 인라인\n- [ ] 렌더 차단 리소스 제거\n\n### INP 개선\n\n- [ ] Long Task > 50ms 제거\n- [ ] 이벤트 핸들러 최적화\n- [ ] 무거운 연산 Web Worker로 이동\n- [ ] `useTransition`, `useDeferredValue` 활용\n- [ ] Third-party 스크립트 지연 로딩\n\n### CLS 개선\n\n- [ ] 모든 이미지\u002F비디오 크기 지정\n- [ ] 동적 콘텐츠 공간 확보 (스켈레톤)\n- [ ] `font-display: swap` 설정\n- [ ] transform\u002Fopacity만 애니메이션\n\n## Workflow\n\n### 1. 성능 측정\n\n```bash\n# Lighthouse CLI\nnpx lighthouse https:\u002F\u002Fexample.com --output=json --output-path=.\u002Flh-report.json\n\n# 또는 Chrome DevTools > Lighthouse 탭\n```\n\n### 2. 문제 진단\n\n```\nLCP > 2.5s?\n→ Network 탭에서 LCP 리소스 확인\n→ 이미지 최적화 \u002F 프리로드 적용\n\nINP > 200ms?\n→ Performance 탭에서 Long Task 확인\n→ 태스크 분할 \u002F Web Worker 적용\n\nCLS > 0.1?\n→ Layout Shift 원인 요소 확인\n→ 크기 지정 \u002F 스켈레톤 적용\n```\n\n### 3. 모니터링\n\n```\n프로덕션:\n- Google Search Console Core Web Vitals\n- Real User Monitoring (RUM)\n- web-vitals 라이브러리\n\nCI\u002FCD:\n- Lighthouse CI\n- Performance Budget 설정\n```\n\n## References\n\n- [web.dev Core Web Vitals](https:\u002F\u002Fweb.dev\u002Fvitals\u002F)\n- [Lighthouse](https:\u002F\u002Fdeveloper.chrome.com\u002Fdocs\u002Flighthouse\u002F)\n- [web-vitals library](https:\u002F\u002Fgithub.com\u002FGoogleChrome\u002Fweb-vitals)\n",{"name":5,"license":15,"metadata":24,"description":7,"allowed-tools":27},{"author":25,"version":26},"antigravity-team","1.0","Read, Glob, Grep, Edit, Write, Bash","master","63f17866001c5ca854bf2fa0b678ce277133de5b","skills\u002Fmarketplace\u002Fperformance-vitals",0,"https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS","https:\u002F\u002Fbg-szy.github.io\u002FTOP-SKILLS\u002F","https:\u002F\u002Fgithub.com\u002Fbg-szy","https:\u002F\u002Fwww.ecust.edu.cn\u002F","a student of East China University of Science and Technology","2026-11-15 03:38:02",{"source":8,"skillName":5,"commands":39,"prompt":49,"zipAvailable":50},[40,43,46],{"tool":41,"command":42},"npx","npx skills add bg-szy\u002FTOP-SKILLS --skill performance-vitals",{"tool":44,"command":45},"bunx","bunx skills add bg-szy\u002FTOP-SKILLS --skill performance-vitals",{"tool":47,"command":48},"pnpm","pnpm dlx skills add bg-szy\u002FTOP-SKILLS --skill performance-vitals","安装技能，技能地址：https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Fperformance-vitals\u002FSKILL.md",true,[52],{"path":53,"resourceType":54,"resourceTypeDesc":55,"sizeBytes":56,"sourceHtmlUrl":57},"skill-report.json","REFERENCE","参考文档",42556,"https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Fperformance-vitals\u002Fskill-report.json",[59,67,74,81,88,95],{"skillNo":60,"name":61,"nameZh":6,"description":62,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":63,"categories":64,"keywords":65,"publishedAt":66},"01M7DXW9N826PKXK174PVW3038","serpmaven","Scrape Google search results (SERP) to JSON with SERP Maven (serpmaven) - a real Chrome browser on a residential proxy with sticky sessions. Run it as a CLI, a Python library, a local HTTP search API (`serve`), an MCP server or a Docker image; set the proxy login, workers, pages and cost tracking. Use when the user wants Google results, rank tracking, a self-hosted SERP API, or live Google search for an AI agent.","https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Fserpmaven\u002FSKILL.md",[],[],"2026-11-15 14:19:17",{"skillNo":68,"name":69,"nameZh":6,"description":70,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":71,"categories":72,"keywords":73,"publishedAt":66},"01M7DXVHSTWDV65475QEQ915M7","revnu-landing-page-audit","Find out why a landing page isn't turning visitors into signups, demos or sales. Audits one page against what the ad, post or search that sends people there promised, then checks the first screen, proof, call to action, friction and mobile. Returns at most 7 prioritized fixes, plus what is fine and what could not be checked; rewrites specific lines and fixes the page in the repo when asked. Never promises a conversion lift. Works without a Revnu account. Use when the user says or asks: \"audit my landing page\", \"why isn't this page converting\", \"review my homepage\", \"my ads get clicks but no signups\", \"people bounce from the pricing page\", \"CRO review\", \"improve conversion rate\", \"is my hero section clear\", \"roast my landing page\", \"rewrite my headline\", \"what's wrong with this page\", \"landing page feedback\", \"make the signup page convert better\". Not for SEO or AI-search audits, page speed engineering on its own, or building a new page from scratch.","https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Frevnu-landing-page-audit\u002FSKILL.md",[],[],{"skillNo":75,"name":76,"nameZh":6,"description":77,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":78,"categories":79,"keywords":80,"publishedAt":66},"01M7DXV8X2D7B3VTD4HHYYHTGR","revnu-growth-context","Write down once who buys, what they're stuck on, what it costs, what proof you have and what you've already tried, so every growth task starts from facts instead of a questionnaire. Creates or updates .agents\u002Frevnu-growth.md from the repo, the live site and the user, and imports an existing product-marketing.md. Use when the user says \"set up our marketing context\", \"who is our ideal customer\", \"write our ICP\", \"describe the product for marketing\", \"positioning doc\", \"what's our brand voice\", \"remember this about our customers\", \"log what we tried\", \"what have we learned from marketing\", \"we changed pricing, update the context\", \"update our growth notes\", \"summarize the business for the agent\", \"import my product-marketing.md\", \"start a growth doc\", or before a first marketing, SEO, outreach or launch task when no context file exists. Works without a Revnu account.","https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Frevnu-growth-context\u002FSKILL.md",[],[],{"skillNo":82,"name":83,"nameZh":6,"description":84,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":85,"categories":86,"keywords":87,"publishedAt":66},"01M7DXV0DGJ1G0A60PAHC6J3C5","revnu-get-listed","Get onto the third-party pages AI answers and search cite when buyers ask for the best tool in your category: \"best X\" roundups, directories, review sites, GitHub awesome lists, community threads and comparison pages. Finds which ones are cited, ranks them by fit and effort, and drafts each submission, PR or pitch by the target's own rules. Use when the user says \"get us listed\", \"which directories should we submit to\", \"how do we get into best-of lists\", \"why does ChatGPT recommend competitors and not us\", \"get mentioned in AI answers\", \"submit to awesome lists\", \"get on G2\", \"where are our competitors listed\", \"pitch listicle authors\", \"find backlink opportunities\", \"launch directories\", \"get into roundups\", \"Product Hunt alternatives\", \"where should we be listed\", \"get cited by Perplexity\". Never submits, pays or posts without a yes. Works without a Revnu account.","https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Frevnu-get-listed\u002FSKILL.md",[],[],{"skillNo":89,"name":90,"nameZh":6,"description":91,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":92,"categories":93,"keywords":94,"publishedAt":66},"01M7DXTSPMGT9D6DSS0HP9BSTA","revnu-ai-readiness-audit","Audit whether your website gives ChatGPT, Perplexity, Claude, Gemini and Google's AI Overviews something worth quoting, and fix the pages that don't. Use when the user says or asks \"is my site ready for AI search\", \"audit my site for AI answers\", \"AEO audit\", \"GEO audit\", \"why doesn't ChatGPT quote our pricing\", \"make our pages citable by AI\", \"do I need llms.txt\", \"does schema help with ChatGPT\", \"check our structured data\", \"is our content visible without JavaScript\", \"AI SEO audit\", \"optimize our homepage for AI answers\", \"LLM SEO check\", \"why does AI get our product wrong\", \"fix our site for AI Overviews\". Checks fetchability and indexability, answers in the raw HTML, entity facts, schema (including JS-injected markup), headings, dates and llms.txt, then gives at most 10 prioritised fixes and edits the repo when asked. Works without a Revnu account.","https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Frevnu-ai-readiness-audit\u002FSKILL.md",[],[],{"skillNo":96,"name":97,"nameZh":6,"description":98,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":99,"categories":100,"keywords":101,"publishedAt":66},"01M7DXSZHCVTRS620GC3S97JZV","proxy-troubleshooting","Diagnose residential proxy failures, with NodeMaven's gateway as the reference - 407 with correct credentials, 406, 410, 500, a connection that hangs, ERR_TUNNEL_CONNECTION_FAILED in a browser, Playwright or Puppeteer ignoring proxy credentials, a sticky session that changes IP, geo-targeting that is silently ignored, passwords with special characters, and unexpected traffic from headless Chrome. Use when a proxy connection fails, returns the wrong location, or costs more traffic than expected.","https:\u002F\u002Fgithub.com\u002Fbg-szy\u002FTOP-SKILLS\u002Fblob\u002Fmaster\u002Fskills\u002Fmarketplace\u002Fproxy-troubleshooting\u002FSKILL.md",[],[]]