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⚡ Bolt: 셀 렌더링 성능 최적화 (DOM 할당 오버헤드 감소) #362

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⚡ Bolt: 셀 렌더링 성능 최적화 (DOM 할당 오버헤드 감소) #362

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3 changes: 3 additions & 0 deletions .jules/bolt.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,3 +4,6 @@
## 2026-07-12 - Optimize renderTaskRow DOM allocations
**Learning:** Caching unattached template nodes and instantiating them via `.cloneNode(false)` reduces DOM instantiation overhead in O(N) render loops significantly.
**Action:** Apply this optimization to other hot-path rendering elements such as rows, cells, and stack containers.
## 2026-07-27 - Optimize badge DOM allocations
**Learning:** Expanding the caching strategy (caching unattached template nodes and instantiating them via `.cloneNode(false)`) to cell renderers like owner and status badges reduces JS-to-C++ instantiation overhead during O(N) DOM rendering loops.
**Action:** Always apply template caching to any repeatedly constructed DOM elements in list or table rendering loops.
16 changes: 13 additions & 3 deletions app.js
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Expand Up @@ -952,6 +952,8 @@ function createWarningBadge(warning) {

const persistentOwnerColorMap = new Map();

let ownerBadgeTemplate = null;

function createOwnerCellContent(owner) {
if (!owner) {
return createEmptyCell();
Expand All @@ -961,18 +963,26 @@ function createOwnerCellContent(owner) {
persistentOwnerColorMap.set(owner, OWNER_COLORS[persistentOwnerColorMap.size % OWNER_COLORS.length]);
}

const badge = document.createElement('span');
badge.className = 'owner-badge';
if (!ownerBadgeTemplate) {
ownerBadgeTemplate = document.createElement('span');
ownerBadgeTemplate.className = 'owner-badge';
}
const badge = ownerBadgeTemplate.cloneNode(false);
badge.style.background = persistentOwnerColorMap.get(owner);
badge.textContent = owner;
return badge;
}

let statusBadgeTemplate = null;

function createStatusCellContent(progressState) {
if (!progressState.label) {
return createEmptyCell();
}
const badge = document.createElement('span');
if (!statusBadgeTemplate) {
statusBadgeTemplate = document.createElement('span');
}
const badge = statusBadgeTemplate.cloneNode(false);
badge.className = `status-badge ${progressState.className}`;
badge.textContent = progressState.label;
if (progressState.description) {
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