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⚡ Bolt: Gantt 차트 렌더링 성능 최적화 #330

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⚡ Bolt: Gantt 차트 렌더링 성능 최적화 #330

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⚡ Bolt: Gantt 차트 렌더링 성능 최적화
seonghobae Jul 17, 2026
f71d3b8
⚡ Bolt: Gantt 차트 렌더링 성능 최적화
seonghobae Jul 17, 2026
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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.
## 2026-07-17 - Optimize Gantt Chart Rendering
**Learning:** O(N) loops creating multiple DOM nodes via document.createElement causes significant JS-to-C++ allocation overhead.
**Action:** When creating thousands of elements like in gantt chart cells or rows, cache static templates utilizing cloneNode() instead of dynamically creating elements.
31 changes: 26 additions & 5 deletions app.js
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Expand Up @@ -2315,6 +2315,11 @@ function renderGantt() {
elements.ganttContent.replaceChildren(shell);
}

// ⚡ Bolt: Cache template elements for Gantt rendering loops
let ganttRowTemplate = null;
let ganttChartCellTemplate = null;
let ganttChartTrackTemplate = null;

function createGanttMetaTable() {
const table = document.createElement('table');
const thead = document.createElement('thead');
Expand All @@ -2340,8 +2345,13 @@ function createGanttMetaTable() {
thead.appendChild(headerRow);

const tbody = document.createElement('tbody');

if (!ganttRowTemplate) {
ganttRowTemplate = document.createElement('tr');
}

state.tasks.forEach((task) => {
const row = document.createElement('tr');
const row = ganttRowTemplate.cloneNode(false);
row.append(
createTableCell('', createTreeCellContent(task.phase || task.activity || task.task || '-', task.depth)),
createTableCell('', createTextCellContent(task.activity)),
Expand Down Expand Up @@ -2385,13 +2395,24 @@ function createGanttChartTable(weeks, weekdays, totalWidth) {
thead.append(weekRow, dayRow);

const tbody = document.createElement('tbody');

if (!ganttRowTemplate) {
ganttRowTemplate = document.createElement('tr');
}
if (!ganttChartCellTemplate) {
ganttChartCellTemplate = document.createElement('td');
}
if (!ganttChartTrackTemplate) {
ganttChartTrackTemplate = document.createElement('div');
ganttChartTrackTemplate.className = 'gantt-day-track';
}

state.tasks.forEach((task) => {
const row = document.createElement('tr');
const cell = document.createElement('td');
const row = ganttRowTemplate.cloneNode(false);
const cell = ganttChartCellTemplate.cloneNode(false);
cell.colSpan = weekdays.length;

const track = document.createElement('div');
track.className = 'gantt-day-track';
const track = ganttChartTrackTemplate.cloneNode(false);
track.style.width = `${totalWidth}px`;

const planBar = createGanttBarElement(task.plannedStartDate, task.plannedEndDate, weekdays, 'plan', task);
Expand Down
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