diff --git a/e2e/ui/studio.spec.ts b/e2e/ui/studio.spec.ts
index dbf939af..69f592a1 100644
--- a/e2e/ui/studio.spec.ts
+++ b/e2e/ui/studio.spec.ts
@@ -33,10 +33,28 @@ test("Studio opens and dismisses detail, Nitro editor and import review", async
 	const errors: string[] = [];
 	const mutations: string[] = [];
 	let metadataRequests = 0;
+	let qualityRequests = 0;
 	page.on("pageerror", (error) => errors.push(error.message));
 	await page.route("**/api/**", async (route) => {
 		const request = route.request();
 		const url = new URL(request.url());
+		if (url.pathname === "/api/admin/studio/nitro-quality") {
+			qualityRequests++;
+			return route.fulfill({
+				json: {
+					report: {
+						scales: [32, 64].map((size) => ({
+							size,
+							state: "missing",
+							assets: [],
+							animations: [],
+							directions: [],
+							issues: [],
+						})),
+					},
+				},
+			});
+		}
 		if (url.pathname === "/api/admin/studio/inspect") {
 			const { classnames } = request.postDataJSON() as { classnames: string[] };
 			return route.fulfill({
@@ -113,6 +131,17 @@ test("Studio opens and dismisses detail, Nitro editor and import review", async
 	await expect(
 		page.getByRole("button", { name: "View Fixture chair", exact: true }),
 	).toBeVisible();
+	const history = page.getByRole("button", {
+		name: "Refresh history",
+		includeHidden: true,
+	});
+	await expect(history).toHaveCount(0);
+	await page.locator("summary").filter({ hasText: "Import history" }).click();
+	await expect(history).toBeVisible();
+	await page.locator("summary").filter({ hasText: "Import history" }).click();
+	await expect(history).toBeHidden();
+	await page.locator("summary").filter({ hasText: "Import history" }).click();
+	await expect(history).toBeVisible();
 	expect(metadataRequests).toBe(0);
 	await page
 		.getByRole("button", { name: "View Fixture chair", exact: true })
@@ -138,6 +167,20 @@ test("Studio opens and dismisses detail, Nitro editor and import review", async
 		editor.getByRole("switch", { name: "Can Sit On", exact: true }),
 	).toBeVisible();
 	expect(metadataRequests).toBe(1);
+	expect(qualityRequests).toBe(0);
+	await editor.getByRole("tab", { name: "32 / 64", exact: true }).click();
+	await expect(
+		editor.getByRole("button", { name: "Preview generation", exact: true }),
+	).toBeVisible();
+	await expect(
+		editor.getByText("Scale 32 · Not included", { exact: true }),
+	).toBeVisible();
+	expect(qualityRequests).toBe(1);
+	await editor.getByRole("tab", { name: "Visual", exact: true }).click();
+	await expect(
+		editor.getByRole("switch", { name: "Can Sit On", exact: true }),
+	).toBeVisible();
+
 	await editor.getByRole("button", { name: "Cancel", exact: true }).click();
 	await expect(editor).toHaveCount(0);
 	await page
diff --git a/src/app/admin/import/furni/nitro-editor-dialog.tsx b/src/app/admin/import/furni/nitro-editor-dialog.tsx
index 4ae1dfce..610a3088 100644
--- a/src/app/admin/import/furni/nitro-editor-dialog.tsx
+++ b/src/app/admin/import/furni/nitro-editor-dialog.tsx
@@ -16,10 +16,10 @@ import {
 	Save,
 	Sparkles,
 } from "lucide-react";
-import { useEffect, useEffectEvent, useState } from "react";
+import { useTranslations } from "next-intl";
+import { lazy, Suspense, useEffect, useEffectEvent, useState } from "react";
 import { toast } from "sonner";
-import { NitroQualityPanel } from "@/components/admin/studio/nitro-quality-panel";
-import { NitroScale32Generator } from "@/components/admin/studio/nitro-scale32-generator";
+
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import {
@@ -41,6 +41,17 @@ import {
 	nitroAnimationStatesCount,
 } from "@/lib/furni/auto-interaction";
 
+const NitroQualityPanel = lazy(() =>
+	import("@/components/admin/studio/nitro-quality-panel").then((module) => ({
+		default: module.NitroQualityPanel,
+	})),
+);
+const NitroScale32Generator = lazy(() =>
+	import("@/components/admin/studio/nitro-scale32-generator").then(
+		(module) => ({ default: module.NitroScale32Generator }),
+	),
+);
+
 interface NitroEditorDialogProps {
 	classname: string;
 	name?: string;
@@ -135,6 +146,7 @@ export function NitroEditorDialog({
 	open,
 	onOpenChange,
 }: NitroEditorDialogProps) {
+	const loadingT = useTranslations("pages.admin.housekeeping");
 	const [metadata, setMetadata] = useState<NitroMetadata | null>(null);
 	const [originalMetadata, setOriginalMetadata] =
 		useState<NitroMetadata | null>(null);
@@ -448,19 +460,21 @@ export function NitroEditorDialog({
 							value="quality"
 							className="min-h-0 overflow-y-auto flex-1 px-4 sm:px-6 py-4"
 						>
-							<NitroScale32Generator
-								classname={classname}
-								disabled={hasChanges || saving}
-								onChanged={(updated) => {
-									setBundleRevision((value) => value + 1);
-									setMetadata(updated as NitroMetadata);
-									setOriginalMetadata(
-										structuredClone(updated) as NitroMetadata,
-									);
-									setJsonText(JSON.stringify(updated, null, 2));
-								}}
-							/>
-							<NitroQualityPanel key={bundleRevision} classname={classname} />
+							<Suspense fallback={<p role="status">{loadingT("loading")}</p>}>
+								<NitroScale32Generator
+									classname={classname}
+									disabled={hasChanges || saving}
+									onChanged={(updated) => {
+										setBundleRevision((value) => value + 1);
+										setMetadata(updated as NitroMetadata);
+										setOriginalMetadata(
+											structuredClone(updated) as NitroMetadata,
+										);
+										setJsonText(JSON.stringify(updated, null, 2));
+									}}
+								/>
+								<NitroQualityPanel key={bundleRevision} classname={classname} />
+							</Suspense>
 						</TabsContent>
 						{/* ── Visual Tab ── */}
 						<TabsContent
diff --git a/src/components/admin/studio/furniture-job-history-body.tsx b/src/components/admin/studio/furniture-job-history-body.tsx
new file mode 100644
index 00000000..44da7536
--- /dev/null
+++ b/src/components/admin/studio/furniture-job-history-body.tsx
@@ -0,0 +1,194 @@
+"use client";
+import Link from "next/link";
+import { useFormatter, useTranslations } from "next-intl";
+import { useState } from "react";
+import { Button } from "@/components/ui/button";
+import { retryableJobItems } from "@/lib/furni/import-job-retry";
+import { ImportAttachmentRecovery } from "./import-attachment-recovery";
+import type { useFurnitureJobs } from "./use-furniture-jobs";
+export function FurnitureJobHistoryBody({
+	state,
+	expanded = false,
+}: {
+	state: ReturnType<typeof useFurnitureJobs>;
+	expanded?: boolean;
+}) {
+	const t = useTranslations("pages.admin.importHistory");
+	const format = useFormatter();
+	const progressT = useTranslations("pages.admin.importProgress");
+	const [limits, setLimits] = useState<Record<string, number>>({});
+	return (
+		<div
+			className={
+				expanded ? "space-y-2 py-2" : "max-h-72 space-y-2 overflow-auto py-2"
+			}
+		>
+			{state.error && <p role="alert">{state.error}</p>}
+			<p className="text-xs text-[var(--admin-text-muted)]">
+				{state.paginated ? t("ownerHistory") : t("historyLimit")}
+			</p>
+			<Button variant="outline" onClick={() => void state.refresh()}>
+				{t("refreshHistory")}
+			</Button>
+			{state.paginated && (
+				<div className="flex items-center gap-3">
+					<Button
+						variant="outline"
+						disabled={state.loading || state.page === 1}
+						onClick={() => void state.navigate("previous")}
+					>
+						{t("previousPage")}
+					</Button>
+					<span>{t("page", { page: state.page })}</span>
+					<Button
+						variant="outline"
+						disabled={state.loading || !state.nextCursor}
+						onClick={() => void state.navigate("next")}
+					>
+						{t("nextPage")}
+					</Button>
+				</div>
+			)}
+			{!state.jobs.length && !state.loading && !state.error && (
+				<p>{t("empty")}</p>
+			)}
+			{state.jobs.map((job) => {
+				const retryItems = retryableJobItems(job);
+				const done = job.items.filter((i) => i.state === "done"),
+					failed = job.items.filter((i) => i.state === "failed");
+				return (
+					<details
+						key={job.id}
+						className="rounded border border-[var(--admin-border)] p-2"
+					>
+						<summary className="cursor-pointer">
+							{format.dateTime(new Date(job.createdAt), {
+								dateStyle: "short",
+								timeStyle: "short",
+							})}{" "}
+							· {t(job.state)} ·{" "}
+							{t("result", {
+								done: done.length,
+								total: job.items.length,
+								failed: failed.length,
+							})}
+						</summary>
+						<progress
+							className="mt-2 h-2 w-full"
+							value={done.length + failed.length}
+							max={Math.max(1, job.items.length)}
+							aria-label={t("progress")}
+						/>
+						<ul className="space-y-1 py-2">
+							{job.items.slice(0, limits[job.id] ?? 50).map((item) => (
+								<li key={item.classname}>
+									<strong>{item.classname}</strong> · {t(item.state)}
+									{item.itemId ? ` · ID ${item.itemId}` : ""}
+									{item.phase &&
+										(item.state === "running" ||
+											item.state === "failed" ||
+											item.state === "interrupted") && (
+											<p className="text-xs text-[var(--admin-text-muted)]">
+												{progressT(
+													item.state === "running" ? "current" : "last",
+													{ phase: progressT(item.phase) },
+												)}
+												{item.state === "running" &&
+													item.phaseStartedAt &&
+													` · ${progressT("elapsed", { seconds: Math.max(0, Math.floor((Date.now() - Date.parse(item.phaseStartedAt)) / 1000)) })}`}
+												{item.sourceAttempt && ` · ${item.sourceAttempt}`}
+											</p>
+										)}
+									{item.recoveredSource && (
+										<p className="break-words text-xs text-[var(--admin-text-muted)]">
+											{progressT("recovered", {
+												source: item.recoveredSource.sourceName,
+												revision: item.recoveredSource.revision,
+											})}
+										</p>
+									)}
+									{item.error && (
+										<p className="text-[var(--admin-warning)]">{item.error}</p>
+									)}
+									{!job.syncKind &&
+										item.state === "failed" &&
+										retryItems.some(
+											(retryItem) => retryItem.classname === item.classname,
+										) && (
+											<ImportAttachmentRecovery
+												jobId={job.id}
+												classname={item.classname}
+												disabled={state.busy}
+												onResumed={state.refresh}
+											/>
+										)}
+									{[...new Set(item.warnings ?? [])].map((warning) => (
+										<p
+											key={warning}
+											className="text-xs text-[var(--admin-text-muted)]"
+										>
+											{warning}
+										</p>
+									))}
+								</li>
+							))}
+						</ul>
+						{job.items.length > (limits[job.id] ?? 50) && (
+							<Button
+								variant="outline"
+								onClick={() =>
+									setLimits((current) => ({
+										...current,
+										[job.id]: (current[job.id] ?? 50) + 50,
+									}))
+								}
+							>
+								{t("showMoreItems")}
+							</Button>
+						)}
+						{(job.state === "queued" || job.state === "running") && (
+							<div className="space-y-2 py-2">
+								<p className="text-xs text-[var(--admin-text-muted)]">
+									{t(job.cancelRequested ? "cancelRequested" : "cancelHint")}
+								</p>
+								<Button
+									variant="outline"
+									disabled={state.cancelling !== null || job.cancelRequested}
+									onClick={() => void state.cancel(job.id)}
+								>
+									{t("cancelRemaining")}
+								</Button>
+							</div>
+						)}
+						{job.items.some(
+							(item) =>
+								item.state === "interrupted" ||
+								item.error?.startsWith("Server restarted during import.") ||
+								(item.state === "running" && job.state === "interrupted"),
+						) && (
+							<p role="alert" className="py-2 text-[var(--admin-warning)]">
+								{t("uncertainOutcome")}{" "}
+								<Link href="/admin/studio/audit" className="underline">
+									{t("reviewLocalData")}
+								</Link>
+							</p>
+						)}
+						{retryItems.length > 0 && (
+							<Button
+								variant="outline"
+								disabled={state.busy}
+								onClick={() => void state.retry(job.id)}
+							>
+								{t(
+									job.state === "interrupted" || job.state === "cancelled"
+										? "retryUnfinished"
+										: "retryFailed",
+								)}
+							</Button>
+						)}
+					</details>
+				);
+			})}
+		</div>
+	);
+}
diff --git a/src/components/admin/studio/furniture-jobs.tsx b/src/components/admin/studio/furniture-jobs.tsx
index d5cc4880..e53eca15 100644
--- a/src/components/admin/studio/furniture-jobs.tsx
+++ b/src/components/admin/studio/furniture-jobs.tsx
@@ -1,11 +1,13 @@
 "use client";
-import Link from "next/link";
-import { useFormatter, useTranslations } from "next-intl";
-import { useState } from "react";
-import { Button } from "@/components/ui/button";
-import { retryableJobItems } from "@/lib/furni/import-job-retry";
-import { ImportAttachmentRecovery } from "./import-attachment-recovery";
+import { useTranslations } from "next-intl";
+import { lazy, Suspense, useState } from "react";
 import type { useFurnitureJobs } from "./use-furniture-jobs";
+
+const HistoryBody = lazy(() =>
+	import("./furniture-job-history-body").then((module) => ({
+		default: module.FurnitureJobHistoryBody,
+	})),
+);
 export function FurnitureJobHistory({
 	state,
 	expanded = false,
@@ -14,12 +16,14 @@ export function FurnitureJobHistory({
 	expanded?: boolean;
 }) {
 	const t = useTranslations("pages.admin.importHistory");
-	const format = useFormatter();
-	const progressT = useTranslations("pages.admin.importProgress");
-	const [limits, setLimits] = useState<Record<string, number>>({});
+	const common = useTranslations("pages.admin.housekeeping");
+	const [opened, setOpened] = useState(expanded);
 	return (
 		<details
 			open={expanded || undefined}
+			onToggle={(event) => {
+				if (event.currentTarget.open) setOpened(true);
+			}}
 			className="shrink-0 border-b border-[var(--admin-border)] bg-[var(--admin-surface)] px-4 py-2 text-sm"
 		>
 			<summary className="cursor-pointer">
@@ -29,180 +33,17 @@ export function FurnitureJobHistory({
 					).length,
 				})}
 			</summary>
-			<div
-				className={
-					expanded ? "space-y-2 py-2" : "max-h-72 space-y-2 overflow-auto py-2"
-				}
-			>
-				{state.error && <p role="alert">{state.error}</p>}
-				<p className="text-xs text-[var(--admin-text-muted)]">
-					{state.paginated ? t("ownerHistory") : t("historyLimit")}
-				</p>
-				<Button variant="outline" onClick={() => void state.refresh()}>
-					{t("refreshHistory")}
-				</Button>
-				{state.paginated && (
-					<div className="flex items-center gap-3">
-						<Button
-							variant="outline"
-							disabled={state.loading || state.page === 1}
-							onClick={() => void state.navigate("previous")}
-						>
-							{t("previousPage")}
-						</Button>
-						<span>{t("page", { page: state.page })}</span>
-						<Button
-							variant="outline"
-							disabled={state.loading || !state.nextCursor}
-							onClick={() => void state.navigate("next")}
-						>
-							{t("nextPage")}
-						</Button>
-					</div>
-				)}
-				{!state.jobs.length && !state.loading && !state.error && (
-					<p>{t("empty")}</p>
-				)}
-				{state.jobs.map((job) => {
-					const retryItems = retryableJobItems(job);
-					const done = job.items.filter((i) => i.state === "done"),
-						failed = job.items.filter((i) => i.state === "failed");
-					return (
-						<details
-							key={job.id}
-							className="rounded border border-[var(--admin-border)] p-2"
-						>
-							<summary className="cursor-pointer">
-								{format.dateTime(new Date(job.createdAt), {
-									dateStyle: "short",
-									timeStyle: "short",
-								})}{" "}
-								· {t(job.state)} ·{" "}
-								{t("result", {
-									done: done.length,
-									total: job.items.length,
-									failed: failed.length,
-								})}
-							</summary>
-							<progress
-								className="mt-2 h-2 w-full"
-								value={done.length + failed.length}
-								max={Math.max(1, job.items.length)}
-								aria-label={t("progress")}
-							/>
-							<ul className="space-y-1 py-2">
-								{job.items.slice(0, limits[job.id] ?? 50).map((item) => (
-									<li key={item.classname}>
-										<strong>{item.classname}</strong> · {t(item.state)}
-										{item.itemId ? ` · ID ${item.itemId}` : ""}
-										{item.phase &&
-											(item.state === "running" ||
-												item.state === "failed" ||
-												item.state === "interrupted") && (
-												<p className="text-xs text-[var(--admin-text-muted)]">
-													{progressT(
-														item.state === "running" ? "current" : "last",
-														{ phase: progressT(item.phase) },
-													)}
-													{item.state === "running" &&
-														item.phaseStartedAt &&
-														` · ${progressT("elapsed", { seconds: Math.max(0, Math.floor((Date.now() - Date.parse(item.phaseStartedAt)) / 1000)) })}`}
-													{item.sourceAttempt && ` · ${item.sourceAttempt}`}
-												</p>
-											)}
-										{item.recoveredSource && (
-											<p className="break-words text-xs text-[var(--admin-text-muted)]">
-												{progressT("recovered", {
-													source: item.recoveredSource.sourceName,
-													revision: item.recoveredSource.revision,
-												})}
-											</p>
-										)}
-										{item.error && (
-											<p className="text-[var(--admin-warning)]">
-												{item.error}
-											</p>
-										)}
-										{!job.syncKind &&
-											item.state === "failed" &&
-											retryItems.some(
-												(retryItem) => retryItem.classname === item.classname,
-											) && (
-												<ImportAttachmentRecovery
-													jobId={job.id}
-													classname={item.classname}
-													disabled={state.busy}
-													onResumed={state.refresh}
-												/>
-											)}
-										{[...new Set(item.warnings ?? [])].map((warning) => (
-											<p
-												key={warning}
-												className="text-xs text-[var(--admin-text-muted)]"
-											>
-												{warning}
-											</p>
-										))}
-									</li>
-								))}
-							</ul>
-							{job.items.length > (limits[job.id] ?? 50) && (
-								<Button
-									variant="outline"
-									onClick={() =>
-										setLimits((current) => ({
-											...current,
-											[job.id]: (current[job.id] ?? 50) + 50,
-										}))
-									}
-								>
-									{t("showMoreItems")}
-								</Button>
-							)}
-							{(job.state === "queued" || job.state === "running") && (
-								<div className="space-y-2 py-2">
-									<p className="text-xs text-[var(--admin-text-muted)]">
-										{t(job.cancelRequested ? "cancelRequested" : "cancelHint")}
-									</p>
-									<Button
-										variant="outline"
-										disabled={state.cancelling !== null || job.cancelRequested}
-										onClick={() => void state.cancel(job.id)}
-									>
-										{t("cancelRemaining")}
-									</Button>
-								</div>
-							)}
-							{job.items.some(
-								(item) =>
-									item.state === "interrupted" ||
-									item.error?.startsWith("Server restarted during import.") ||
-									(item.state === "running" && job.state === "interrupted"),
-							) && (
-								<p role="alert" className="py-2 text-[var(--admin-warning)]">
-									{t("uncertainOutcome")}{" "}
-									<Link href="/admin/studio/audit" className="underline">
-										{t("reviewLocalData")}
-									</Link>
-								</p>
-							)}
-							{retryItems.length > 0 && (
-								<Button
-									variant="outline"
-									disabled={state.busy}
-									onClick={() => void state.retry(job.id)}
-								>
-									{t(
-										job.state === "interrupted" || job.state === "cancelled"
-											? "retryUnfinished"
-											: "retryFailed",
-									)}
-								</Button>
-							)}
-						</details>
-					);
-				})}
-			</div>
+			{(opened || expanded) && (
+				<Suspense
+					fallback={
+						<p role="status" className="py-2">
+							{common("loading")}
+						</p>
+					}
+				>
+					<HistoryBody state={state} expanded={expanded} />
+				</Suspense>
+			)}
 		</details>
 	);
 }
diff --git a/src/lib/studio-bundle.test.ts b/src/lib/studio-bundle.test.ts
new file mode 100644
index 00000000..b82c7dbc
--- /dev/null
+++ b/src/lib/studio-bundle.test.ts
@@ -0,0 +1,48 @@
+import path from "node:path";
+import { build } from "esbuild";
+import { expect, it } from "vitest";
+
+it("keeps scale preview and generation outside the initial Nitro editor bundle", async () => {
+	const entry = "src/app/admin/import/furni/nitro-editor-dialog.tsx";
+	const result = await build({
+		entryPoints: [entry],
+		bundle: true,
+		splitting: true,
+		format: "esm",
+		write: false,
+		outdir: "storage/bundle-check",
+		metafile: true,
+		packages: "external",
+		alias: { "@": path.resolve("src") },
+	});
+	const outputs = result.metafile.outputs;
+	const start = Object.keys(outputs).find(
+		(key) => outputs[key].entryPoint === entry,
+	);
+	expect(start).toBeDefined();
+	const seen = new Set<string>();
+	function visit(key: string) {
+		if (seen.has(key)) return;
+		seen.add(key);
+		for (const dependency of outputs[key].imports) {
+			if (dependency.kind !== "dynamic-import" && !dependency.external)
+				visit(dependency.path);
+		}
+	}
+	if (!start) throw new Error("Missing editor entry bundle");
+	visit(start);
+	const initialInputs = new Set(
+		[...seen].flatMap((key) => Object.keys(outputs[key].inputs)),
+	);
+	for (const name of [
+		"nitro-quality-panel.tsx",
+		"nitro-scale32-generator.tsx",
+	]) {
+		expect(
+			Object.keys(result.metafile.inputs).some((input) => input.endsWith(name)),
+		).toBe(true);
+		expect([...initialInputs].some((input) => input.endsWith(name))).toBe(
+			false,
+		);
+	}
+}, 30_000);