qcast-front/rendering-resource-hints.md at 1dfc9c0ac23ae8f5ef33599c8f112b6b98e32f3c

sangwook yoo 3ac66feba2 chore: .agents/.claude 설정·CLAUDE.md·AGENTS.md git 추적 추가

gitignore 의 *.md / .claude/ 차단을 풀어 다음 파일을 git 으로 추적.
- /CLAUDE.md, /AGENTS.md (루트 에이전트 가이드)
- .agents/**/*.md (skills 문서 95개)
- .claude/settings.json (Claude Code 프로젝트 설정)
.claude/worktrees/ 는 git worktree 메타이므로 신규 ignore 라인으로 제외.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-12 18:05:03 +09:00

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title	impact	impactDescription	tags
Use React DOM Resource Hints	HIGH	reduces load time for critical resources	rendering, preload, preconnect, prefetch, resource-hints

Use React DOM Resource Hints

Impact: HIGH (reduces load time for critical resources)

React DOM provides APIs to hint the browser about resources it will need. These are especially useful in server components to start loading resources before the client even receives the HTML.

prefetchDNS(href): Resolve DNS for a domain you expect to connect to
preconnect(href): Establish connection (DNS + TCP + TLS) to a server
preload(href, options): Fetch a resource (stylesheet, font, script, image) you'll use soon
preloadModule(href): Fetch an ES module you'll use soon
preinit(href, options): Fetch and evaluate a stylesheet or script
preinitModule(href): Fetch and evaluate an ES module

Example (preconnect to third-party APIs):

import { preconnect, prefetchDNS } from 'react-dom'

export default function App() {
  prefetchDNS('https://analytics.example.com')
  preconnect('https://api.example.com')

  return <main>{/* content */}</main>
}

Example (preload critical fonts and styles):

import { preload, preinit } from 'react-dom'

export default function RootLayout({ children }) {
  // Preload font file
  preload('/fonts/inter.woff2', { as: 'font', type: 'font/woff2', crossOrigin: 'anonymous' })

  // Fetch and apply critical stylesheet immediately
  preinit('/styles/critical.css', { as: 'style' })

  return (
    <html>
      <body>{children}</body>
    </html>
  )
}

Example (preload modules for code-split routes):

import { preloadModule, preinitModule } from 'react-dom'

function Navigation() {
  const preloadDashboard = () => {
    preloadModule('/dashboard.js', { as: 'script' })
  }

  return (
    <nav>
      <a href="/dashboard" onMouseEnter={preloadDashboard}>
        Dashboard
      </a>
    </nav>
  )
}

When to use each:

API	Use case
`prefetchDNS`	Third-party domains you'll connect to later
`preconnect`	APIs or CDNs you'll fetch from immediately
`preload`	Critical resources needed for current page
`preloadModule`	JS modules for likely next navigation
`preinit`	Stylesheets/scripts that must execute early
`preinitModule`	ES modules that must execute early

Reference: React DOM Resource Preloading APIs

2.5 KiB Raw Blame History

Use React DOM Resource Hints

2.5 KiB

Raw Blame History