diff --git a/frontend/src/lib/components/AppShell.svelte b/frontend/src/lib/components/AppShell.svelte
index 9fdc887c..a6088ae9 100644
--- a/frontend/src/lib/components/AppShell.svelte
+++ b/frontend/src/lib/components/AppShell.svelte
@@ -6,7 +6,7 @@
 	import { searchFiles } from '$lib/api/endpoints/search';
 	import { fileInlineUrl } from '$lib/api/endpoints/files';
 	import type { FileItem, FolderItem } from '$lib/api/types';
-	import CommandPalette from '$lib/components/CommandPalette.svelte';
+	import { lazyComponent } from '$lib/composables/lazyComponent.svelte';
 	import Icon from '$lib/icons/Icon.svelte';
 	import { iconNameFromClass } from '$lib/utils/display';
 	import { userInitials, avatarColorIndex } from '$lib/utils/avatar';
@@ -19,6 +19,10 @@
 
 	let { children }: { children: Snippet } = $props();
 
+	// The command palette is loaded on its first Cmd/Ctrl+K and mounted open.
+	// Until then its ~400-line module stays out of the initial bundle.
+	const palette = lazyComponent(() => import('$lib/components/CommandPalette.svelte'));
+
 	interface NavLink {
 		href: string;
 		label: string;
@@ -232,6 +236,13 @@
 <svelte:window
 	onclick={closeMenus}
 	onkeydown={(e) => {
+		// First Cmd/Ctrl+K loads the palette and mounts it open; once mounted,
+		// the palette's own handler takes over toggling/closing.
+		if ((e.metaKey || e.ctrlKey) && e.key.toLowerCase() === 'k' && !palette.component) {
+			e.preventDefault();
+			void palette.load();
+			return;
+		}
 		if (e.key !== 'Escape') return;
 		if (aboutOpen) aboutOpen = false;
 		else if (searchActive) closeMobileSearch();
@@ -692,7 +703,10 @@
 	</div>
 {/if}
 
-<CommandPalette />
+{#if palette.component}
+	{@const CommandPalette = palette.component}
+	<CommandPalette autoOpen />
+{/if}
 
 <style>
 	/* Body becomes the sidebar+main flex row only while the shell is mounted. */
diff --git a/frontend/src/lib/components/CommandPalette.svelte b/frontend/src/lib/components/CommandPalette.svelte
index 43958019..d49bdf17 100644
--- a/frontend/src/lib/components/CommandPalette.svelte
+++ b/frontend/src/lib/components/CommandPalette.svelte
@@ -17,6 +17,10 @@
 		run: () => void;
 	}
 
+	// `autoOpen` lets a lazy host (AppShell) mount us already-open on the first
+	// Cmd/Ctrl+K, since our own key listener only exists once we're mounted.
+	let { autoOpen = false }: { autoOpen?: boolean } = $props();
+
 	let open = $state(false);
 	// Drives the enter animation: flipped on after mount so the overlay/panel
 	// transition from their initial (faded/offset) state.
@@ -30,6 +34,18 @@
 	// Element focused before the palette opened, restored on close.
 	let prevFocus: HTMLElement | null = null;
 
+	// When mounted already-open (autoOpen), run the same enter sequence the
+	// keyboard path uses. Guarded so it fires once, not on every reopen.
+	let didAutoOpen = false;
+	$effect(() => {
+		if (didAutoOpen || !autoOpen) return;
+		didAutoOpen = true;
+		open = true;
+		prevFocus = document.activeElement as HTMLElement | null;
+		requestAnimationFrame(() => (entered = true));
+		queueMicrotask(() => input?.focus());
+	});
+
 	function close() {
 		open = false;
 		entered = false;
diff --git a/frontend/src/lib/composables/lazyComponent.svelte.ts b/frontend/src/lib/composables/lazyComponent.svelte.ts
new file mode 100644
index 00000000..4ec04149
--- /dev/null
+++ b/frontend/src/lib/composables/lazyComponent.svelte.ts
@@ -0,0 +1,39 @@
+/**
+ * Defer loading a heavy Svelte component until it is first needed.
+ *
+ * The dynamic `import()` puts the component in its own chunk, keeping it out of
+ * the initial bundle. The component type is inferred from the module's default
+ * export, so binding and prop typing at the call site stay fully checked. Call
+ * `load()` right before the component is shown, then render it once `component`
+ * is non-null:
+ *
+ * ```svelte
+ * const viewer = lazyComponent(() => import('$lib/components/FileViewer.svelte'));
+ * $effect(() => { if (open) void viewer.load(); });
+ * …
+ * {#if viewer.component}
+ *   {@const Viewer = viewer.component}
+ *   <Viewer bind:open {file} />
+ * {/if}
+ * ```
+ */
+export function lazyComponent<C>(loader: () => Promise<{ default: C }>) {
+	let component = $state<C | null>(null);
+	let pending: Promise<void> | null = null;
+
+	return {
+		get component() {
+			return component;
+		},
+		/** Idempotent: kicks off the import once, resolves when the chunk is ready. */
+		load(): Promise<void> {
+			if (component) return Promise.resolve();
+			if (!pending) {
+				pending = loader().then((mod) => {
+					component = mod.default;
+				});
+			}
+			return pending;
+		}
+	};
+}
diff --git a/frontend/src/lib/composables/useOwnerCache.svelte.ts b/frontend/src/lib/composables/useOwnerCache.svelte.ts
index f66fe4bb..4a25eb1e 100644
--- a/frontend/src/lib/composables/useOwnerCache.svelte.ts
+++ b/frontend/src/lib/composables/useOwnerCache.svelte.ts
@@ -31,14 +31,16 @@ export class OwnerCache {
 
 	/** Resolve every not-yet-cached id in parallel; nullish ids are skipped. */
 	async resolve(ids: Iterable<string | null | undefined>): Promise<void> {
-		const unique = [...new Set([...ids].filter((id): id is string => !!id))];
-		await Promise.all(
-			unique.map(async (id) => {
-				if (this.#names[id]) return;
-				const name = await this.#resolver(id);
-				this.#names = { ...this.#names, [id]: name };
-			})
+		const pending = [...new Set([...ids].filter((id): id is string => !!id))].filter(
+			(id) => !this.#names[id]
 		);
+		if (pending.length === 0) return;
+		const resolved = await Promise.all(
+			pending.map(async (id) => [id, await this.#resolver(id)] as const)
+		);
+		// One reactive assignment for the whole batch instead of one per id, so a
+		// large resolve doesn't spread-copy the record N times (and re-run derives N times).
+		this.#names = { ...this.#names, ...Object.fromEntries(resolved) };
 	}
 }
 
diff --git a/frontend/src/lib/stores/files.svelte.ts b/frontend/src/lib/stores/files.svelte.ts
index afd5200c..44de3cea 100644
--- a/frontend/src/lib/stores/files.svelte.ts
+++ b/frontend/src/lib/stores/files.svelte.ts
@@ -96,10 +96,15 @@ class FilesStore {
 		this.selection = new Set();
 	}
 
+	// Soft ceiling so the per-item toggle can't grow the set without bound.
+	// (Bulk "select all" lives in the views and intentionally isn't capped —
+	// silently dropping ids there would break batch delete/move.)
+	static readonly MAX_SELECTION = 10_000;
+
 	toggleSelected(id: string): void {
 		const next = new Set(this.selection);
 		if (next.has(id)) next.delete(id);
-		else next.add(id);
+		else if (next.size < FilesStore.MAX_SELECTION) next.add(id);
 		this.selection = next;
 	}
 }
diff --git a/frontend/src/routes/admin/+page.svelte b/frontend/src/routes/admin/+page.svelte
index 153fa157..5f3f7aea 100644
--- a/frontend/src/routes/admin/+page.svelte
+++ b/frontend/src/routes/admin/+page.svelte
@@ -320,7 +320,7 @@
 		try {
 			migration = await getMigration();
 			if (migration.status === 'running') {
-				if (!migrationTimer) migrationTimer = setInterval(loadMigration, 2000);
+				if (!migrationTimer) migrationTimer = setInterval(loadMigration, 5000);
 			} else {
 				stopMigrationPoll();
 			}
diff --git a/frontend/src/routes/favorites/+page.svelte b/frontend/src/routes/favorites/+page.svelte
index c5d7965c..df2f5f80 100644
--- a/frontend/src/routes/favorites/+page.svelte
+++ b/frontend/src/routes/favorites/+page.svelte
@@ -17,7 +17,7 @@
 	import { renameFile, deleteFile } from '$lib/api/endpoints/files';
 	import { renameFolder, deleteFolder } from '$lib/api/endpoints/folders';
 	import type { FileItem } from '$lib/api/types';
-	import FileViewer from '$lib/components/FileViewer.svelte';
+	import { lazyComponent } from '$lib/composables/lazyComponent.svelte';
 	import MoveDialog from '$lib/components/MoveDialog.svelte';
 	import ShareDialog from '$lib/components/ShareDialog.svelte';
 	import ResourceList, {
@@ -123,6 +123,13 @@
 	let viewerOpen = $state(false);
 	let viewerFile = $state<FileItem | null>(null);
 
+	// The file preview is loaded the first time a file is opened, keeping its
+	// module out of this route's initial chunk.
+	const fileViewer = lazyComponent(() => import('$lib/components/FileViewer.svelte'));
+	$effect(() => {
+		if (viewerOpen) void fileViewer.load();
+	});
+
 	function open(entry: ResourceEntry) {
 		if (entry.kind === 'folder') {
 			goto(`/files/${entry.id}`);
@@ -305,7 +312,10 @@
 	{/snippet}
 </ResourceList>
 
-<FileViewer bind:open={viewerOpen} file={viewerFile} />
+{#if fileViewer.component}
+	{@const FileViewer = fileViewer.component}
+	<FileViewer bind:open={viewerOpen} file={viewerFile} />
+{/if}
 <MoveDialog
 	bind:open={moveOpen}
 	item={moveTarget}
diff --git a/frontend/src/routes/files/[...path]/+page.svelte b/frontend/src/routes/files/[...path]/+page.svelte
index 04815336..c9d3a223 100644
--- a/frontend/src/routes/files/[...path]/+page.svelte
+++ b/frontend/src/routes/files/[...path]/+page.svelte
@@ -37,12 +37,11 @@
 	import { apiFetch } from '$lib/api/client';
 	import { getCsrfHeaders } from '$lib/api/csrf';
 	import type { FileItem, FolderItem, ItemType } from '$lib/api/types';
-	import FileViewer from '$lib/components/FileViewer.svelte';
 	import ListToolbar from '$lib/components/ListToolbar.svelte';
 	import VirtualList from '$lib/components/VirtualList.svelte';
 	import MoveDialog from '$lib/components/MoveDialog.svelte';
 	import ShareDialog from '$lib/components/ShareDialog.svelte';
-	import WopiEditor from '$lib/components/WopiEditor.svelte';
+	import { lazyComponent } from '$lib/composables/lazyComponent.svelte';
 	import { t } from '$lib/i18n/index.svelte';
 	import { confirmDialog, promptDialog } from '$lib/stores/dialogs.svelte';
 	import { files as filesStore } from '$lib/stores/files.svelte';
@@ -59,6 +58,12 @@
 	import { formatDate, iconNameFromClass } from '$lib/utils/display';
 	import { gridColumns } from '$lib/utils/grid';
 
+	// File preview and the WOPI editor are heavy and only appear on demand, so
+	// their modules load the first time the user opens one (see the effects that
+	// call `.load()` when `viewerOpen` / `wopiOpen` flip true).
+	const fileViewer = lazyComponent(() => import('$lib/components/FileViewer.svelte'));
+	const wopiEditor = lazyComponent(() => import('$lib/components/WopiEditor.svelte'));
+
 	// The URL rest param is the trail of folder ids from home's children down.
 	// /files → home root; /files/a/b → folder b inside a inside home.
 	const pathSegments = $derived((page.params.path ?? '').split('/').filter((s) => s.length > 0));
@@ -806,6 +811,13 @@
 	let wopiOpen = $state(false);
 	let wopiAction = $state<'edit' | 'view'>('edit');
 	let wopiFile = $state<{ id: string; name: string } | null>(null);
+
+	// Pull in the on-demand modules the moment they're first needed; after that
+	// the chunk is cached and the component stays mounted (controlled by `open`).
+	$effect(() => {
+		if (viewerOpen) void fileViewer.load();
+		if (wopiOpen) void wopiEditor.load();
+	});
 	// Editability of the current context-menu target file, resolved async.
 	let ctxCanEditWopi = $state(false);
 
@@ -1636,13 +1648,19 @@
 	item={actionTarget}
 	onshared={(id) => (sharedIds = new Set(sharedIds).add(id))}
 />
-<FileViewer bind:open={viewerOpen} file={viewerFile} />
-<WopiEditor
-	bind:open={wopiOpen}
-	fileId={wopiFile?.id ?? null}
-	fileName={wopiFile?.name ?? ''}
-	action={wopiAction}
-/>
+{#if fileViewer.component}
+	{@const FileViewer = fileViewer.component}
+	<FileViewer bind:open={viewerOpen} file={viewerFile} />
+{/if}
+{#if wopiEditor.component}
+	{@const WopiEditor = wopiEditor.component}
+	<WopiEditor
+		bind:open={wopiOpen}
+		fileId={wopiFile?.id ?? null}
+		fileName={wopiFile?.name ?? ''}
+		action={wopiAction}
+	/>
+{/if}
 
 {#if ctxOpen && ctxTarget}
 	<div
diff --git a/frontend/src/routes/photos/+page.svelte b/frontend/src/routes/photos/+page.svelte
index 91a5e4f9..140449e9 100644
--- a/frontend/src/routes/photos/+page.svelte
+++ b/frontend/src/routes/photos/+page.svelte
@@ -1,10 +1,8 @@
 <script lang="ts">
 	import Button from '$lib/components/Button.svelte';
 	import EmptyState from '$lib/components/EmptyState.svelte';
-	import PeopleView from '$lib/components/PeopleView.svelte';
-	import PhotoLightbox from '$lib/components/PhotoLightbox.svelte';
-	import PlacesMap from '$lib/components/PlacesMap.svelte';
 	import VirtualRows from '$lib/components/VirtualRows.svelte';
+	import { lazyComponent } from '$lib/composables/lazyComponent.svelte';
 	import { useSelection } from '$lib/composables/useSelection.svelte';
 	import { errorToast } from '$lib/utils/errors';
 	import { onMount } from 'svelte';
@@ -24,6 +22,13 @@
 
 	type Tab = 'moments' | 'places' | 'people';
 	let tab = $state<Tab>('moments');
+
+	// The lightbox, the (maplibre-backed) places map and the people view are all
+	// heavy and off the initial path, so each loads on first use: the lightbox
+	// when a photo is opened, the map/people views when their tab is selected.
+	const photoLightbox = lazyComponent(() => import('$lib/components/PhotoLightbox.svelte'));
+	const placesMap = lazyComponent(() => import('$lib/components/PlacesMap.svelte'));
+	const peopleView = lazyComponent(() => import('$lib/components/PeopleView.svelte'));
 	let peopleAvailable = $state(false);
 
 	let items = $state<PhotoItem[]>([]);
@@ -44,6 +49,12 @@
 	const selected = useSelection();
 	let lightbox = $state(-1); // index into `items`, -1 = closed
 
+	$effect(() => {
+		if (lightbox >= 0) void photoLightbox.load();
+		if (tab === 'places') void placesMap.load();
+		else if (tab === 'people') void peopleView.load();
+	});
+
 	/** Client-generated video frame thumbnails (file id → data/URL). */
 	let videoThumbs = $state<Record<string, string>>({});
 
@@ -290,11 +301,16 @@
 				['large', 800, 800]
 			];
 			let previewData = '';
-			for (const [size, w, h] of SIZES) {
-				const blob = await bitmapToBlob(bitmap, w, h);
-				if (size === 'preview') previewData = await blobToDataUrl(blob);
-				await uploadThumbnail(file.id, size, blob).catch(() => {});
-			}
+			// Render the blobs and push all three sizes in parallel; `previewData`
+			// is captured before its upload so the local preview shows even if that
+			// upload fails (allSettled swallows per-size failures, as before).
+			await Promise.allSettled(
+				SIZES.map(async ([size, w, h]) => {
+					const blob = await bitmapToBlob(bitmap, w, h);
+					if (size === 'preview') previewData = await blobToDataUrl(blob);
+					await uploadThumbnail(file.id, size, blob);
+				})
+			);
 			if (previewData) videoThumbs = { ...videoThumbs, [file.id]: previewData };
 		} catch {
 			// Keep the generic play badge on failure.
@@ -487,11 +503,20 @@
 	<div bind:this={sentinel} class="sentinel" aria-hidden="true"></div>
 	{#if loading}<p class="status">{t('common.loading', 'Loading…')}</p>{/if}
 
-	<PhotoLightbox {items} bind:index={lightbox} onDelete={onDeletePhoto} />
+	{#if photoLightbox.component}
+		{@const PhotoLightbox = photoLightbox.component}
+		<PhotoLightbox {items} bind:index={lightbox} onDelete={onDeletePhoto} />
+	{/if}
 {:else if tab === 'places'}
-	<PlacesMap />
+	{#if placesMap.component}
+		{@const PlacesMap = placesMap.component}
+		<PlacesMap />
+	{/if}
 {:else if tab === 'people'}
-	<PeopleView />
+	{#if peopleView.component}
+		{@const PeopleView = peopleView.component}
+		<PeopleView />
+	{/if}
 {/if}
 
 {#snippet tile(photo: PhotoItem, sizeStyle?: string)}
diff --git a/frontend/src/routes/recent/+page.svelte b/frontend/src/routes/recent/+page.svelte
index 2205294f..32ac1585 100644
--- a/frontend/src/routes/recent/+page.svelte
+++ b/frontend/src/routes/recent/+page.svelte
@@ -17,7 +17,7 @@
 	import { fileDownloadUrl, renameFile, deleteFile } from '$lib/api/endpoints/files';
 	import { renameFolder, deleteFolder } from '$lib/api/endpoints/folders';
 	import type { FileItem, ItemType } from '$lib/api/types';
-	import FileViewer from '$lib/components/FileViewer.svelte';
+	import { lazyComponent } from '$lib/composables/lazyComponent.svelte';
 	import MoveDialog from '$lib/components/MoveDialog.svelte';
 	import ShareDialog from '$lib/components/ShareDialog.svelte';
 	import ResourceList, {
@@ -134,6 +134,13 @@
 	let viewerOpen = $state(false);
 	let viewerFile = $state<FileItem | null>(null);
 
+	// The file preview is loaded the first time a file is opened, keeping its
+	// module out of this route's initial chunk.
+	const fileViewer = lazyComponent(() => import('$lib/components/FileViewer.svelte'));
+	$effect(() => {
+		if (viewerOpen) void fileViewer.load();
+	});
+
 	function open(entry: ResourceEntry) {
 		if (entry.kind === 'folder') {
 			goto(`/files/${entry.id}`);
@@ -349,7 +356,10 @@
 	{/snippet}
 </ResourceList>
 
-<FileViewer bind:open={viewerOpen} file={viewerFile} />
+{#if fileViewer.component}
+	{@const FileViewer = fileViewer.component}
+	<FileViewer bind:open={viewerOpen} file={viewerFile} />
+{/if}
 <MoveDialog
 	bind:open={moveOpen}
 	item={moveTarget}
diff --git a/frontend/src/routes/shared-with-me/+page.svelte b/frontend/src/routes/shared-with-me/+page.svelte
index ab101b80..2a49b1dd 100644
--- a/frontend/src/routes/shared-with-me/+page.svelte
+++ b/frontend/src/routes/shared-with-me/+page.svelte
@@ -4,7 +4,7 @@
 	import { onMount } from 'svelte';
 	import { fetchSharedWithMe, type IncomingGrantItem } from '$lib/api/endpoints/grants';
 	import type { FileItem } from '$lib/api/types';
-	import FileViewer from '$lib/components/FileViewer.svelte';
+	import { lazyComponent } from '$lib/composables/lazyComponent.svelte';
 	import ResourceList, { type ResourceEntry } from '$lib/components/ResourceList.svelte';
 	import { t } from '$lib/i18n/index.svelte';
 
@@ -48,6 +48,13 @@
 	let viewerOpen = $state(false);
 	let viewerFile = $state<FileItem | null>(null);
 
+	// The file preview is loaded the first time a file is opened, keeping its
+	// module out of this route's initial chunk.
+	const fileViewer = lazyComponent(() => import('$lib/components/FileViewer.svelte'));
+	$effect(() => {
+		if (viewerOpen) void fileViewer.load();
+	});
+
 	function open(entry: ResourceEntry) {
 		if (entry.kind === 'folder') {
 			goto(`/files/${entry.id}`);
@@ -76,4 +83,7 @@
 	onopen={open}
 />
 
-<FileViewer bind:open={viewerOpen} file={viewerFile} />
+{#if fileViewer.component}
+	{@const FileViewer = fileViewer.component}
+	<FileViewer bind:open={viewerOpen} file={viewerFile} />
+{/if}