diff --git a/A00_Common/spreadsheet/spreadsheet_data_menu.ts b/A00_Common/spreadsheet/spreadsheet_data_menu.ts
index 3dbdc1d9..3339afae 100644
--- a/A00_Common/spreadsheet/spreadsheet_data_menu.ts
+++ b/A00_Common/spreadsheet/spreadsheet_data_menu.ts
@@ -17,7 +17,6 @@ import { autoSumRange } from "./spreadsheet_autosum";
 import { isError } from "./spreadsheet_eval";
 import type { FilterHandle } from "./spreadsheet_filter";
 import { createCondFmtPanel } from "./spreadsheet_condfmt";
-import { createNameManagerPanel } from "./spreadsheet_names";
 import { createSheetExtraPanel } from "./spreadsheet_sheet_extra";
 import { mountActions } from "./spreadsheet_actions";
 import type { ErrorTipHandle } from "./spreadsheet_errcheck";
@@ -174,7 +173,14 @@ export function mountDataMenu(ctx: SpreadsheetContext, back: () => void): DataMe
       [TEXT.filterItem, () => (toggleFilter(), back())],
       [TEXT.condfmt, () => void openPanel(TEXT.condfmt, async () => createCondFmtPanel)],
       [TEXT.validation, () => void openPanel(TEXT.validation, async () => createValidationPanel)],
-      [TEXT.names, () => void openPanel(TEXT.names, async () => createNameManagerPanel)],
+      [
+        TEXT.names,
+        () =>
+          void openPanel(
+            TEXT.names,
+            async () => (await import("./spreadsheet_names")).createNameManagerPanel,
+          ),
+      ],
       [TEXT.sheets, () => void openPanel(TEXT.sheets, async () => createSheetExtraPanel)],
       [TEXT.grid, () => (toggleGridlines(), back())],
       ...act.items,
diff --git a/A00_Common/spreadsheet/spreadsheet_editor.ts b/A00_Common/spreadsheet/spreadsheet_editor.ts
index 3ede2592..86d1a14e 100644
--- a/A00_Common/spreadsheet/spreadsheet_editor.ts
+++ b/A00_Common/spreadsheet/spreadsheet_editor.ts
@@ -11,8 +11,7 @@
 import { el, showToast } from "@ui/ui_template_elements";
 import { moveFormula } from "./spreadsheet_refshift";
 import { colName, parseA1, parseRange, rangeToA1, toA1 } from "./spreadsheet_address";
-import { funcHelp, suggestFunctions, type FuncHelp } from "./spreadsheet_func_help";
-import { defineName, resolveName } from "./spreadsheet_names";
+import type { FuncHelp } from "./spreadsheet_func_help";
 import { parseFormula, tokenize } from "./spreadsheet_parser";
 import { cellsOf, move, selectCell } from "./spreadsheet_selection";
 import { checkValue, findValidation } from "./spreadsheet_validation";
@@ -284,13 +283,15 @@ export function createEditor(ctx: SpreadsheetContext): Editor {
   let sugg: FuncHelp[] = [];
   let pick = 0;
   let typed = "";
+  let fh: typeof import("./spreadsheet_func_help") | null = null; // 식을 처음 칠 때 불러옴 — 크기 예산
 
   function showHint(): void {
     const node = src();
     const h = st ? formulaHint(node.value.slice(0, node.selectionEnd)) : null;
-    sugg = h && "prefix" in h ? suggestFunctions(h.prefix).slice(0, 8) : [];
+    if (h && !fh) return void import("./spreadsheet_func_help").then((m) => ((fh = m), showHint()));
+    sugg = h && "prefix" in h ? fh!.suggestFunctions(h.prefix).slice(0, 8) : [];
     typed = h && "prefix" in h ? h.prefix : "";
-    const help = h && "func" in h ? funcHelp(h.func) : null;
+    const help = h && "func" in h ? fh!.funcHelp(h.func) : null;
     if (!sugg.length && !help) return void hint.setAttribute("hidden", "");
     pick = Math.min(pick, Math.max(0, sugg.length - 1));
     hint.replaceChildren(
@@ -489,7 +490,8 @@ export function createEditor(ctx: SpreadsheetContext): Editor {
   });
 
   /** 이름 상자(sub4) — 있는 이름이면 그 범위로 · 없으면 지금 고름에 이름을 붙임(엑셀) */
-  function nameBox(name: string): void {
+  async function nameBox(name: string): Promise<void> {
+    const { defineName, resolveName } = await import("./spreadsheet_names"); // 늦게 — 크기 예산
     const hit = resolveName(ctx.book, ctx.selection.시트, name);
     if (hit) {
       if (hit.시트 !== ctx.selection.시트) ctx.showSheet(hit.시트);
@@ -514,7 +516,7 @@ export function createEditor(ctx: SpreadsheetContext): Editor {
     const body = value.slice(bang + 1).replace(/\$/g, "");
     const one = parseA1(body);
     const g = parseRange(body);
-    if (!g) return nameBox(value.trim());
+    if (!g) return void nameBox(value.trim());
     if (one) return ctx.select(selectCell(sheet, one.r, one.c), true);
     const at = { r: g.r0, c: g.c0 };
     ctx.select({ 시트: sheet.id, 범위: [g], 활성: at, 기준: { ...at } }, true);
diff --git a/A00_Common/spreadsheet/spreadsheet_extras.ts b/A00_Common/spreadsheet/spreadsheet_extras.ts
index 13be5d3c..ccf2db0c 100644
--- a/A00_Common/spreadsheet/spreadsheet_extras.ts
+++ b/A00_Common/spreadsheet/spreadsheet_extras.ts
@@ -13,8 +13,9 @@ import { attachComments, getComment, setComment } from "./spreadsheet_comments";
 import { mountDataMenu } from "./spreadsheet_data_menu";
 import type { Editor } from "./spreadsheet_editor";
 import type { FindPanelHandle } from "./spreadsheet_find_panel";
-import { createFormatPainter } from "./spreadsheet_format_painter";
+import type { FormatPainterHandle } from "./spreadsheet_format_painter";
 import type { KeyHooks } from "./spreadsheet_keys";
+import type { Memo } from "./spreadsheet_memo";
 import type { MouseHooks } from "./spreadsheet_mouse";
 import type { PasteSpecialMode } from "./spreadsheet_paste_special";
 import type { PartHandle, SpreadsheetContext } from "./spreadsheet_view_types";
@@ -24,7 +25,6 @@ const TEXT = {
   painter: "서식 붓 — 한 번 누르면 한 번 · 두 번 누르면 Esc 까지 계속",
   pasteTitle: "골라 붙여넣기",
   modes: { 값: "값만", 서식: "서식만", 수식: "수식만" } as Record<PasteSpecialMode, string>,
-  memo: "메모 — Ctrl+Enter 또는 밖을 누르면 적용 · Esc 취소",
 };
 
 export interface Extras {
@@ -62,40 +62,20 @@ export function attachExtras(
   // ── 메모 — 풍선 · 편집 ─────────────────────────────────────────────────
   const comments = attachComments(ctx);
   let hovered = "";
-  const memo = el("textarea", { className: "ss-memo", attrs: { hidden: "", title: TEXT.memo } });
-  ctx.root.append(memo);
-  let memoAt: { r: number; c: number } | null = null;
-  const closeMemo = (save: boolean): void => {
-    if (!memoAt) return;
-    const at = memoAt;
-    memoAt = null;
-    memo.setAttribute("hidden", "");
-    if (save && memo.value !== (getComment(ctx.sheet(), at.r, at.c) ?? ""))
-      setComment(ctx, at.r, at.c, memo.value.trim());
-    back();
-  };
-  memo.addEventListener("keydown", (e) => {
-    if (e.key === "Escape" || (e.key === "Enter" && e.ctrlKey)) {
-      e.preventDefault();
-      e.stopPropagation();
-      closeMemo(e.key === "Enter");
-    }
-  });
-  memo.addEventListener("blur", () => closeMemo(true));
-
-  function editMemo(): void {
+  let memo: Memo | null = null; // 처음 쓸 때 불러옴 — 크기 예산
+  async function editMemo(): Promise<void> {
     if (ctx.readOnly) return;
     const { r, c } = ctx.selection.활성;
-    memoAt = { r, c };
+    memo ??= (await import("./spreadsheet_memo")).createMemo(ctx, back, {
+      get: getComment,
+      set: setComment,
+    });
     comments.hideBalloon();
-    memo.value = getComment(ctx.sheet(), r, c) ?? "";
-    memo.removeAttribute("hidden");
-    put(memo, r, c);
-    memo.focus();
+    memo.open(r, c, (node) => put(node, r, c));
   }
 
   // ── 서식 붓 ─────────────────────────────────────────────────────────────
-  const painter = createFormatPainter(ctx);
+  let painter: FormatPainterHandle | null = null; // 처음 누를 때 불러옴 — 크기 예산
   let sticky = false;
   const brush = el("button", {
     className: "ss-brush",
@@ -103,10 +83,12 @@ export function attachExtras(
     attrs: { type: "button", title: TEXT.painter },
   });
   const showBrush = (): void => {
-    brush.classList.toggle("is-on", painter.active());
-    ctx.root.classList.toggle("ss--painting", painter.active());
+    const on = !!painter?.active();
+    brush.classList.toggle("is-on", on);
+    ctx.root.classList.toggle("ss--painting", on);
   };
-  brush.addEventListener("click", (e) => {
+  brush.addEventListener("click", async (e) => {
+    painter ??= (await import("./spreadsheet_format_painter")).createFormatPainter(ctx);
     if (e.detail === 2) sticky = true;
     else if (painter.active()) (painter.clear(), (sticky = false));
     else (painter.pick(), (sticky = false));
@@ -198,7 +180,7 @@ export function attachExtras(
       toolbarRoot?.removeEventListener("click", onToolbarClick);
       toolbarRoot?.removeEventListener("change", back);
       find?.destroy();
-      memo.remove();
+      memo?.destroy();
       picker.remove();
       brush.remove();
       fmt.remove();
@@ -209,18 +191,18 @@ export function attachExtras(
     keys: {
       find: (replace) => void openFind(replace),
       pasteSpecial: () => (armed = true),
-      comment: editMemo,
+      comment: () => void editMemo(),
       formatDialog: () => void openFormat(),
       ...data.keys,
       escape() {
-        painter.clear();
+        painter?.clear();
         sticky = false;
         showBrush();
       },
     },
     mouse: {
       selected() {
-        if (!painter.active()) return;
+        if (!painter?.active()) return;
         painter.paint(ctx.selection.범위[0], sticky);
         showBrush();
       },
@@ -228,7 +210,7 @@ export function attachExtras(
         const key = hit?.kind === "cell" ? `${hit.r},${hit.c}` : "";
         if (key === hovered) return;
         hovered = key;
-        if (!hit || !key || memoAt || !getComment(ctx.sheet(), hit.r, hit.c))
+        if (!hit || !key || memo?.busy() || !getComment(ctx.sheet(), hit.r, hit.c))
           return comments.hideBalloon();
         comments.showBalloon(hit.r, hit.c);
         put(comments.root!, hit.r, hit.c); // showBalloon 의 cellBox 자리 → 화면 자리로 고침
diff --git a/A00_Common/spreadsheet/spreadsheet_memo.ts b/A00_Common/spreadsheet/spreadsheet_memo.ts
new file mode 100644
index 00000000..baa05cca
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_memo.ts
@@ -0,0 +1,59 @@
+/* =============================================================================
+ * spreadsheet_memo.ts  (주인 D)
+ * 메모 편집(Shift+F2) — 칸 옆 글상자 · Ctrl+Enter 또는 밖을 누르면 적용 · Esc 취소.
+ * 처음 쓸 때 `spreadsheet_extras.ts` 가 불러옴(크기 예산).
+ * ========================================================================== */
+
+import { el } from "@ui/ui_template_elements";
+import type { getComment, setComment } from "./spreadsheet_comments";
+import type { SpreadsheetContext } from "./spreadsheet_view_types";
+
+const TITLE = "메모 — Ctrl+Enter 또는 밖을 누르면 적용 · Esc 취소";
+
+export interface Memo {
+  /** (r, c) 메모를 열고 `place` 로 칸 옆에 둠 */
+  open(r: number, c: number, place: (node: HTMLElement) => void): void;
+  /** 편집 중인가 — 풍선을 띄우지 않음 */
+  busy(): boolean;
+  destroy(): void;
+}
+
+/** 메모 읽기 · 쓰기는 부른 쪽이 넘김 — 여기서 끌어오면 메모 조각이 따로 쪼개져 크기가 늘어남 */
+export function createMemo(
+  ctx: SpreadsheetContext,
+  back: () => void,
+  io: { get: typeof getComment; set: typeof setComment },
+): Memo {
+  const memo = el("textarea", { className: "ss-memo", attrs: { hidden: "", title: TITLE } });
+  ctx.root.append(memo);
+  let memoAt: { r: number; c: number } | null = null;
+  const close = (save: boolean): void => {
+    if (!memoAt) return;
+    const at = memoAt;
+    memoAt = null;
+    memo.setAttribute("hidden", "");
+    if (save && memo.value !== (io.get(ctx.sheet(), at.r, at.c) ?? ""))
+      io.set(ctx, at.r, at.c, memo.value.trim());
+    back();
+  };
+  memo.addEventListener("keydown", (e) => {
+    if (e.key === "Escape" || (e.key === "Enter" && e.ctrlKey)) {
+      e.preventDefault();
+      e.stopPropagation();
+      close(e.key === "Enter");
+    }
+  });
+  memo.addEventListener("blur", () => close(true));
+
+  return {
+    open(r, c, place) {
+      memoAt = { r, c };
+      memo.value = io.get(ctx.sheet(), r, c) ?? "";
+      memo.removeAttribute("hidden");
+      place(memo);
+      memo.focus();
+    },
+    busy: () => !!memoAt,
+    destroy: () => memo.remove(),
+  };
+}
diff --git a/A00_Common/spreadsheet/spreadsheet_mouse.ts b/A00_Common/spreadsheet/spreadsheet_mouse.ts
index 4d5c03b8..e35ecda2 100644
--- a/A00_Common/spreadsheet/spreadsheet_mouse.ts
+++ b/A00_Common/spreadsheet/spreadsheet_mouse.ts
@@ -6,7 +6,6 @@
  * 머리 끝(폭 · 높이 끌기)은 C 몫 — 여기서 건드리지 않음.
  * ========================================================================== */
 
-import { autofitColumn } from "./spreadsheet_autofit";
 import { fillCells } from "./spreadsheet_fill";
 import {
   hasValue,
@@ -242,7 +241,10 @@ export function attachMouse(
       // 고른 열 전체의 경계면 고른 열 모두(엑셀)
       const g = ctx.selection.범위[0];
       const whole = g.r0 === 0 && g.r1 === LAST_R && inRange(g, 0, hit.c);
-      for (let c = whole ? g.c0 : hit.c; c <= (whole ? g.c1 : hit.c); c++) autofitColumn(ctx, c);
+      void import("./spreadsheet_autofit").then((m) => {
+        for (let c = whole ? g.c0 : hit.c; c <= (whole ? g.c1 : hit.c); c++)
+          m.autofitColumn(ctx, c);
+      }); // 늦게 — 크기 예산
       return;
     }
     if (hit.kind === "cell" && !ed.editing()) ed.begin();