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⚡ Bolt: fetchpriority="low"를 추가하여 지연 로딩 오프스크린 이미지 우선순위 최적화 - #285

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bolt-fetchpriority-low-3645565473549011254
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bolt-fetchpriority-low-3645565473549011254

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@seonghobae

@seonghobae seonghobae commented Oct 4, 2026 •

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💡 What:
명시적으로 지연 로딩(loading="lazy")되는 오프스크린 이미지들에 fetchpriority="low" 속성을 추가했습니다. (index.html, 404.html)

🎯 Why:
loading="lazy"는 브라우저가 레이아웃을 계산한 후에야 리소스의 우선순위를 낮춥니다. fetchpriority="low"를 함께 명시하면 브라우저의 preload scanner가 레이아웃 단계 이전인 파싱 단계에서부터 해당 리소스가 비핵심(non-critical)임을 미리 인지하여, 렌더링에 중요한 다른 리소스(CSS, 폰트, LCP 이미지 등)의 다운로드를 방해하지 않도록 대기열 우선순위를 최적화할 수 있습니다.

📊 Impact:
Preload scanner 최적화를 통해 핵심 렌더링 경로(Critical Rendering Path)의 블로킹을 방지하고, 메인 콘텐츠의 FCP(First Contentful Paint) 및 LCP(Largest Contentful Paint) 지표 안정성에 기여합니다. (브라우저 호환성이 매우 높은 안전한 힌트 속성이며, 기존 동작을 해치지 않습니다.)

🔬 Measurement:
로컬 테스트(tests/test_styles.py)를 통해 지연 로딩 이미지에 fetchpriority="low" 속성이 올바르게 주입되었음을 검증했습니다. 브라우저 개발자 도구의 Network 탭에서 lazy 이미지들의 초기 Fetch 우선순위가 명시적으로 낮춰졌는지 확인할 수 있습니다.


PR created automatically by Jules for task 3645565473549011254 started by @seonghobae

Summary by CodeRabbit

  • 성능 개선
    • 화면 밖에서 지연 로딩되는 이미지에 낮은 가져오기 우선순위를 적용해, 주요 콘텐츠를 우선적으로 불러오도록 했습니다.

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coderabbitai Bot commented Oct 4, 2026 •

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Review in Change Stack →

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🧰 Additional context used
📚 Code guidelines (2)
AGENTS.md — auto-discovered
CLAUDE.md — auto-discovered

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration
  • Configuration used: Organization UI
  • Review profile: CHILL
  • Plan: Advanced
  • Run ID: 23f6630e-7e4d-4d3b-8b2e-97c3a6f948fd
📥 Commits

Reviewing files that changed from the base of the PR and between 7c4251d and 95b2272.

📒 Files selected for processing (4)
  • .jules/bolt.md
  • 404.html
  • index.html
  • tests/test_styles.py

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📝 Walkthrough

Walkthrough

화면 밖에서 지연 로딩하는 이미지에 fetchpriority="low"를 추가했습니다. 적용 지침과 테스트도 갱신했습니다.

Changes

지연 로딩 이미지 우선순위

Layer / File(s) Summary
이미지 우선순위 설정과 검증
.jules/bolt.md, index.html, 404.html, tests/test_styles.py
지연 로딩 이미지에 fetchpriority="low"를 추가했습니다. 학습 지침에 해당 설정을 반영하고, 홈페이지의 지연 로딩 이미지가 낮은 우선순위를 사용하는지 테스트합니다.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 95b22

현재 홈페이지와 404 페이지의 대상 이미지에 낮은 우선순위가 지정되어 있고, 홈페이지 테스트는 해당 힌트의 누락을 감지합니다. 404 로고는 그 테스트에 포함되지 않지만, 확인된 현재 동작 결함은 없어 병합을 막을 위험은 없습니다.

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed 제목은 화면 밖 지연 로딩 이미지에 fetchpriority="low"를 추가하는 주요 변경 사항을 명확하게 설명합니다.
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files. (3 skipped: 3 …
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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