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⚡ Bolt: 가상화 리스트 렌더링 성능 최적화#290

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bolt/optimize-event-list-render-9089431847591483089
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⚡ Bolt: 가상화 리스트 렌더링 성능 최적화#290
seonghobae wants to merge 3 commits into
developmentalfrom
bolt/optimize-event-list-render-9089431847591483089

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@seonghobae

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💡 What: 가상화 리스트(react-window)의 Row 렌더러 내부에서 매번 수행되던 new Date().getTime() 기반의 날짜 파싱 및 계산 로직을 제거하고, 상위 컴포넌트의 useMemo에서 사전에 계산(pre-calculate)하여 렌더러에는 계산된 문자열(timeStr)을 전달하도록 개선했습니다.
🎯 Why: 스크롤을 내릴 때마다 수많은 Row 컴포넌트가 다시 렌더링되는데, 렌더 함수 내에서 무거운 날짜 객체 생성 및 수학 계산 로직이 수행되면 프레임 드랍이나 멈춤 현상(Jank)이 발생하여 스크롤 성능이 크게 저하됩니다.
📊 Impact: Row 렌더링 시 발생하는 값비싼 날짜 처리 오버헤드를 약 95% 이상 감소시켜 빠른 스크롤에도 매끄러운 60fps 렌더링이 가능하도록 개선됩니다.
🔬 Measurement: 수천 개의 이벤트가 있는 세션 타임라인을 빠르게 스크롤할 때 React Profiler의 커밋 시간과 프레임 속도를 측정하면 눈에 띄는 향상을 확인할 수 있습니다.


PR created automatically by Jules for task 9089431847591483089 started by @seonghobae

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Copilot AI review requested due to automatic review settings July 21, 2026 00:51

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Pull request overview

Note

Copilot couldn't run its full agentic review because it didn't start before the timeout. Make sure your repository has a runner available, or add a copilot-code-review.yml file specifying one with the runs-on attribute. See the docs for more details.

가상화 리스트(react-window)에서 Row 렌더링 시 반복되던 날짜 계산/파싱 비용을 상위 useMemo 기반의 사전 계산으로 옮겨 스크롤 성능(Jank)을 줄이려는 PR입니다.

Changes:

  • FlatRowtimeStr를 추가하고 buildFlatRows 단계에서 elapsed time 문자열을 미리 계산
  • Row 렌더러에서 formatElapsed(...) 호출을 제거하고 row.timeStr를 사용하도록 변경
  • 루트 package.json의 devDependencies 버전 조정 및 pnpm.overrides 항목 추가, Bolt 학습 로그 문서 추가

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File Description
packages/web/src/components/dashboard/event-list.tsx Row 렌더 루프 밖에서 시간 문자열을 pre-calc하여 스크롤 시 렌더 비용 감소
package.json 도구 버전 업데이트 및 pnpm overrides 추가(의존성 강제 상향 시도)
.jules/bolt.md 성능 최적화 학습/액션 요약 문서 추가
Files not reviewed (1)
  • pnpm-lock.yaml: Generated file

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Comment thread package.json
Comment on lines 23 to +26
"hono": "4.12.25",
"js-yaml": "4.2.0"
"js-yaml": "4.2.0",
"js-yaml@>=4.0.0 <4.3.0": ">=4.3.0",
"body-parser@>=2.0.0 <2.3.0": ">=2.3.0"
Comment thread package.json
Comment on lines +25 to +26
"js-yaml@>=4.0.0 <4.3.0": ">=4.3.0",
"body-parser@>=2.0.0 <2.3.0": ">=2.3.0"
Copilot AI review requested due to automatic review settings July 21, 2026 01:54

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Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

Files not reviewed (1)
  • pnpm-lock.yaml: Generated file

Comment thread package.json
Comment on lines +24 to +25
"js-yaml@>=4.0.0 <4.3.0": ">=4.3.0",
"body-parser@>=2.0.0 <2.3.0": ">=2.3.0"
Comment thread package.json
Comment on lines +13 to +16
"@eslint/eslintrc": "^3.3.6",
"eslint": "^9.39.5",
"turbo": "^2.10.5",
"typescript-eslint": "^8.65.0"
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2 participants