---
id: wiki-2026-0508-성능-및-seo-최적화-프로젝트
title: 성능 및 SEO 최적화 프로젝트
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [Performance and SEO Project, Web Vitals Optimization Project]
duplicate_of: none
source_trust_level: A
confidence_score: 0.9
verification_status: applied
tags: [project, performance, seo, web-vitals, lighthouse]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
  language: typescript
  framework: nextjs
---

# 성능 및 SEO 최적화 프로젝트

## 매 한 줄
> **"매 Web Vitals + SEO 의 simultaneous improvement project"**. 매 Lighthouse 60→95+ 의 typical scope — LCP/INP/CLS 의 budget 의 set, render-blocking 의 eliminate, structured data 의 add, Core Web Vitals 의 Google ranking signal 의 secure.

## 매 핵심

### 매 project goals (KPI)
- **LCP** ≤ 2.5s (good).
- **INP** ≤ 200ms (replaces FID, 2024+).
- **CLS** ≤ 0.1.
- **Lighthouse Performance** ≥ 90.
- **organic traffic** +30% (post 1Q).
- **conversion** +10%.

### 매 phase plan
1. **Audit** (week 1): Lighthouse + WebPageTest + RUM (CrUX) baseline.
2. **Quick wins** (week 2-3): image lazy + dimensions, font-display, defer JS.
3. **Architecture** (week 4-6): RSC migration, route-split, edge caching.
4. **SEO** (week 4-6): meta + OG + JSON-LD + sitemap + canonical.
5. **Monitoring** (ongoing): Vercel Speed Insights / SpeedCurve / Sentry.

### 매 SEO checklist
- `<title>` (50-60 chars), `<meta description>` (150-160).
- Open Graph + Twitter Card.
- JSON-LD (Article / Product / Breadcrumb).
- canonical, hreflang, robots.
- sitemap.xml + robots.txt.
- semantic HTML (h1 unique, landmark).
- internal link graph.

## 💻 패턴

### Performance budget (CI)
```js
// lighthouserc.js
module.exports = {
  ci: {
    collect: { url: ['https://staging.example.com/'], numberOfRuns: 3 },
    assert: {
      assertions: {
        'categories:performance':       ['error', { minScore: 0.9 }],
        'largest-contentful-paint':     ['error', { maxNumericValue: 2500 }],
        'cumulative-layout-shift':      ['error', { maxNumericValue: 0.1 }],
        'interaction-to-next-paint':    ['error', { maxNumericValue: 200 }],
      },
    },
    upload: { target: 'temporary-public-storage' },
  },
};
```

### Next.js metadata (App Router)
```tsx
// app/blog/[slug]/page.tsx
export async function generateMetadata({ params }): Promise<Metadata> {
  const post = await getPost(params.slug);
  return {
    title: `${post.title} | MySite`,
    description: post.excerpt,
    alternates: { canonical: `https://mysite.com/blog/${post.slug}` },
    openGraph: {
      title: post.title,
      description: post.excerpt,
      images: [{ url: post.cover, width: 1200, height: 630 }],
      type: 'article',
    },
    twitter: { card: 'summary_large_image' },
  };
}
```

### JSON-LD structured data
```tsx
function ArticleJsonLd({ post }: { post: Post }) {
  const ld = {
    '@context': 'https://schema.org',
    '@type': 'Article',
    headline: post.title,
    image: [post.cover],
    datePublished: post.publishedAt,
    author: [{ '@type': 'Person', name: post.author }],
  };
  return <script type="application/ld+json"
    dangerouslySetInnerHTML={{ __html: JSON.stringify(ld) }} />;
}
```

### Image optimization
```tsx
import Image from 'next/image';
<Image src="/hero.jpg" alt="hero" width={1200} height={630}
  priority sizes="(max-width: 768px) 100vw, 1200px"
  placeholder="blur" blurDataURL={post.lqip} />
```

### Font optimization (Next.js)
```tsx
import { Inter } from 'next/font/google';
const inter = Inter({ subsets: ['latin'], display: 'swap', preload: true });
export default function Layout({ children }) {
  return <html className={inter.className}>{children}</html>;
}
```

### Web Vitals reporting
```tsx
// app/web-vitals.tsx
'use client';
import { useReportWebVitals } from 'next/web-vitals';
export function WebVitals() {
  useReportWebVitals((m) => {
    fetch('/api/vitals', { method: 'POST', body: JSON.stringify(m), keepalive: true });
  });
  return null;
}
```

### Sitemap (Next.js 15)
```tsx
// app/sitemap.ts
export default async function sitemap() {
  const posts = await getAllPosts();
  return posts.map(p => ({
    url: `https://mysite.com/blog/${p.slug}`,
    lastModified: p.updatedAt,
    changeFrequency: 'weekly',
    priority: 0.7,
  }));
}
```

## 매 결정 기준
| 문제 | Action |
|---|---|
| LCP 느림 | hero image preload + `priority` + RSC streaming |
| INP 느림 | hydration 의 reduce (RSC), long task 의 break |
| CLS 발생 | image/font dimensions, ad slot reserve |
| 매 SSR 필요 | Next.js App Router (RSC) |
| 매 SEO 우선 | static generation (`generateStaticParams`) |
| 매 대량 page | ISR (`revalidate`) |

**기본값**: 매 Next.js 15 (App Router) + Image/Font 의 use, Lighthouse CI 의 budget enforce, JSON-LD 의 add.

## 🔗 Graph
- 부모: [[브라우저 렌더링 파이프라인(Critical Rendering Path)]]
- 변형: [[Web Vitals]] · [[Lighthouse CI]]

## 🤖 LLM 활용
**언제**: Lighthouse report 의 prioritize, regression 의 diagnose, meta tag 의 generate.
**언제 X**: real RUM data analysis (BigQuery/CrUX 의 use).

## ❌ 안티패턴
- **Lighthouse 만 의 measure**: 매 lab data — 매 RUM (CrUX) 의 substitute.
- **`priority` 의 모든 image**: 매 LCP 의 confused — 매 hero 만.
- **Empty meta description**: 매 SERP 의 random snippet.
- **Duplicate H1**: 매 SEO penalty — 매 unique 의 keep.

## 🧪 검증 / 중복
- Verified (web.dev/learn/performance, Next.js 15 docs, Google Search Central, Lighthouse CI docs).
- 신뢰도 A.

## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — Web Vitals + Next.js metadata + Lighthouse CI 의 정리 |
