diff --git a/A00_Common/spreadsheet/spreadsheet_data_menu.ts b/A00_Common/spreadsheet/spreadsheet_data_menu.ts
index 63721d63..431cd309 100644
--- a/A00_Common/spreadsheet/spreadsheet_data_menu.ts
+++ b/A00_Common/spreadsheet/spreadsheet_data_menu.ts
@@ -5,6 +5,7 @@
  *   조건부 서식 · 데이터 유효성 · 이름 관리 · 시트 숨김/탭 색(sub4 패널 — 부품 오른위 창에 띄움) · 눈금선 ·
  *   수식 분석(sub3 — 선행 · 종속 추적 화살표 · 화살표 지우기 · 수식 계산 · 오류 ⚠ 풍선) · 자동 합계(Σ · Alt+=).
  * 유효성 목록 칸은 고르면 칸 옆 ▼ · Alt+↓ 로 값 목록(필터 머리 칸이면 필터 목록이 먼저).
+ * 누를 때만 쓰는 창(정렬 · 조건부 서식 · 시트)은 `import()` 로 늦게 — 크기 예산(열 때 받는 조각).
  * ========================================================================== */
 
 import "./spreadsheet_stage3.css"; // sub4 패널 스타일(잇는 쪽이 붙임)
@@ -12,13 +13,10 @@ import { createMapContextMenu, type MapContextMenuItem } from "@ui/ui_template_c
 import { el, showToast } from "@ui/ui_template_elements";
 import { parseRange, rangeToA1, toA1 } from "./spreadsheet_address";
 import { autoSumRange } from "./spreadsheet_autosum";
-import { createCondFmtPanel } from "./spreadsheet_condfmt";
 import { attachErrorTip } from "./spreadsheet_errcheck";
 import { openEvalSteps } from "./spreadsheet_eval_steps";
 import { attachFilter, toggleFilter } from "./spreadsheet_filter";
 import { createNameManagerPanel } from "./spreadsheet_names";
-import { createSheetExtraPanel } from "./spreadsheet_sheet_extra";
-import { openSortDialog, sortSelection } from "./spreadsheet_sort_dialog";
 import { attachTrace } from "./spreadsheet_trace";
 import {
   createValidationDropdown,
@@ -108,7 +106,11 @@ export function mountDataMenu(ctx: SpreadsheetContext, back: () => void): DataMe
     closePanel();
     back();
   });
-  function openPanel(name: string, make: (c: SpreadsheetContext) => PartHandle): void {
+  async function openPanel(
+    name: string,
+    load: () => Promise<(c: SpreadsheetContext) => PartHandle>,
+  ): Promise<void> {
+    const make = await load();
     closePanel();
     panel = make(ctx);
     title.textContent = name.replace("…", "");
@@ -116,15 +118,42 @@ export function mountDataMenu(ctx: SpreadsheetContext, back: () => void): DataMe
     dialog.removeAttribute("hidden");
   }
 
+  const sorting = () => import("./spreadsheet_sort_dialog");
+  async function sortQuick(desc: boolean): Promise<void> {
+    (await sorting()).sortSelection(ctx, desc);
+    back();
+  }
+  async function sortDialog(): Promise<void> {
+    const m = await sorting();
+    closeSort?.();
+    closeSort = m.openSortDialog(ctx);
+  }
+  function evalSteps(): void {
+    closeSteps?.();
+    closeSteps = openEvalSteps(ctx);
+  }
+
   function openMenu(anchor: HTMLElement): void {
     const r = anchor.getBoundingClientRect();
     const items: MapContextMenuItem[] = [
-      [TEXT.sort, () => ((closeSort = openSortDialog(ctx)), undefined)],
+      [TEXT.sort, () => void sortDialog()],
       [TEXT.filterItem, () => (toggleFilter(ctx), back())],
-      [TEXT.condfmt, () => openPanel(TEXT.condfmt, createCondFmtPanel)],
-      [TEXT.validation, () => openPanel(TEXT.validation, createValidationPanel)],
-      [TEXT.names, () => openPanel(TEXT.names, createNameManagerPanel)],
-      [TEXT.sheets, () => openPanel(TEXT.sheets, createSheetExtraPanel)],
+      [
+        TEXT.condfmt,
+        () =>
+          void openPanel(TEXT.condfmt, () =>
+            import("./spreadsheet_condfmt").then((m) => m.createCondFmtPanel),
+          ),
+      ],
+      [TEXT.validation, () => void openPanel(TEXT.validation, async () => createValidationPanel)],
+      [TEXT.names, () => void openPanel(TEXT.names, async () => createNameManagerPanel)],
+      [
+        TEXT.sheets,
+        () =>
+          void openPanel(TEXT.sheets, () =>
+            import("./spreadsheet_sheet_extra").then((m) => m.createSheetExtraPanel),
+          ),
+      ],
       [TEXT.grid, () => (toggleGridlines(), back())],
       {
         label: TEXT.audit,
@@ -132,7 +161,7 @@ export function mountDataMenu(ctx: SpreadsheetContext, back: () => void): DataMe
           [TEXT.prec, () => traced(trace.precedents())],
           [TEXT.dep, () => traced(trace.dependents())],
           [TEXT.clear, () => (trace.clear(), back())],
-          [TEXT.steps, () => (closeSteps?.(), (closeSteps = openEvalSteps(ctx)))],
+          [TEXT.steps, evalSteps],
         ],
       },
     ];
@@ -201,8 +230,8 @@ export function mountDataMenu(ctx: SpreadsheetContext, back: () => void): DataMe
   const buttons = ctx.readOnly
     ? []
     : [
-        button("↑", TEXT.asc, () => sortSelection(ctx, false)),
-        button("↓", TEXT.desc, () => sortSelection(ctx, true)),
+        button("↑", TEXT.asc, () => void sortQuick(false), true),
+        button("↓", TEXT.desc, () => void sortQuick(true), true),
         button("필터", TEXT.filter, () => toggleFilter(ctx)),
         button("Σ", TEXT.sum, autosum, true),
         button(TEXT.menu, TEXT.menu, openMenu, true),
diff --git a/A00_Common/spreadsheet/spreadsheet_extras.ts b/A00_Common/spreadsheet/spreadsheet_extras.ts
index 863a8d27..2c78275d 100644
--- a/A00_Common/spreadsheet/spreadsheet_extras.ts
+++ b/A00_Common/spreadsheet/spreadsheet_extras.ts
@@ -12,7 +12,6 @@ import { attachComments, getComment, setComment } from "./spreadsheet_comments";
 import { mountDataMenu } from "./spreadsheet_data_menu";
 import type { Editor } from "./spreadsheet_editor";
 import { mountFindPanel } from "./spreadsheet_find_panel";
-import { openFormatDialog } from "./spreadsheet_format_dialog";
 import { createFormatPainter } from "./spreadsheet_format_painter";
 import type { KeyHooks } from "./spreadsheet_keys";
 import type { MouseHooks } from "./spreadsheet_mouse";
@@ -116,9 +115,9 @@ export function attachExtras(
     attrs: { type: "button", title: TEXT.format },
   });
   /** 창이 닫히면(확인 · 취소) 초점을 격자로 */
-  function openFormat(): void {
+  async function openFormat(): Promise<void> {
     if (ctx.readOnly) return;
-    openFormatDialog(ctx);
+    (await import("./spreadsheet_format_dialog")).openFormatDialog(ctx); // 늦게 — 크기 예산
     const watch = new MutationObserver(() => {
       if (document.querySelector(".ss-fmtdlg")) return;
       watch.disconnect();
@@ -126,7 +125,7 @@ export function attachExtras(
     });
     watch.observe(document.body, { childList: true });
   }
-  fmt.addEventListener("click", openFormat);
+  fmt.addEventListener("click", () => void openFormat());
   if (!ctx.readOnly) ed.bar.prepend(fmt, brush);
 
   // ── 데이터 단추 · 메뉴(정렬 · 필터 · 조건부 서식 · 유효성 · 이름 · 눈금선) ─────────
@@ -207,7 +206,7 @@ export function attachExtras(
       find: (replace) => find.open(replace),
       pasteSpecial: () => (armed = true),
       comment: editMemo,
-      formatDialog: openFormat,
+      formatDialog: () => void openFormat(),
       ...data.keys,
       escape() {
         painter.clear();