perf(web): parse timestamp primitives without Date allocation - #428
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V8 엔진 환경에서 반복문 및 잦은 연산 내 `new Date(string).getTime()` 호출 시 불필요한 메모리 할당 및 가비지 컬렉션(GC) 부하가 발생합니다. 이를 `Date.parse(string)`로 대체하여 객체 생성 없이 타임스탬프를 획득하도록 개선했습니다. 이로써 차트 렌더링 및 포맷팅 시 메모리 사용량과 연산 속도가 소폭 향상됩니다.
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seonghobae
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🧹 Nitpick comments (1)
packages/web/src/components/dashboard/session-timeline-chart.tsx (1)
70-81: 🚀 Performance & Scalability | 🔵 Trivial | ⚡ Quick win정렬 전에 timestamp를 한 번만 파싱하세요.
현재 comparator는 정렬 비교마다
Date.parse를 호출합니다. 동일한usage.timestamp가O(n log n)번 파싱될 수 있습니다. 정렬 후 Line 81에서도 다시 파싱합니다. 큰 배열 성능을 목표로 한다면 파싱 결과와 usage를 함께 저장하고,currentTimestamp에 재사용하세요.개선 예시
- const sortedUsage = [...usageTimeline].sort( - (a, b) => Date.parse(a.timestamp) - Date.parse(b.timestamp) - ) + const sortedUsage = usageTimeline + .map((usage) => ({ usage, timestamp: Date.parse(usage.timestamp) })) + .sort((a, b) => a.timestamp - b.timestamp) ... - return sortedUsage.map((usage) => { - const currentTimestamp = Date.parse(usage.timestamp) + return sortedUsage.map(({ usage, timestamp: currentTimestamp }) => {🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@packages/web/src/components/dashboard/session-timeline-chart.tsx` around lines 70 - 81, Update the sortedUsage preparation in the session timeline mapping flow to parse each usage timestamp once before sorting, storing the parsed timestamp together with its usage; sort using the stored numeric timestamp and reuse that value as currentTimestamp inside the map callback. Keep the existing tool sorting and cumulative count behavior unchanged.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Nitpick comments:
In `@packages/web/src/components/dashboard/session-timeline-chart.tsx`:
- Around line 70-81: Update the sortedUsage preparation in the session timeline
mapping flow to parse each usage timestamp once before sorting, storing the
parsed timestamp together with its usage; sort using the stored numeric
timestamp and reuse that value as currentTimestamp inside the map callback. Keep
the existing tool sorting and cumulative count behavior unchanged.
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📒 Files selected for processing (3)
.jules/bolt.mdpackages/web/src/components/dashboard/session-timeline-chart.tsxpackages/web/src/lib/format.ts
1 participant
What
Replace repeated
new Date(value).getTime()calls withDate.parse(value)where the code needs only a timestamp primitive.Why
Both forms use the same ECMAScript string-parsing semantics at these call sites.
Date.parseavoids constructing a short-livedDateobject in chart sorting/mapping and duration formatting paths.Scope and evidence
Original Jules task: 3456526884730841367.
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