diff --git a/apps/web/src/desktop-cache.ts b/apps/web/src/desktop-cache.ts
index 3aec002..b1e091a 100644
--- a/apps/web/src/desktop-cache.ts
+++ b/apps/web/src/desktop-cache.ts
@@ -1,4 +1,3 @@
-import { invoke } from "@tauri-apps/api/core";
 import { isDesktopRuntime } from "./desktop-runtime";
 
 export type DesktopCacheKind = "navigation" | "inbox" | "search" | "conversation";
@@ -9,6 +8,7 @@ const desktopOfflineKey = "mailflow.desktop.offline";
 async function invokeDesktop<T>(command: string, arguments_: Record<string, unknown> = {}) {
   if (!isDesktopRuntime()) return undefined;
   try {
+    const { invoke } = await import("@tauri-apps/api/core");
     return await invoke<T>(command, arguments_);
   } catch {
     return undefined;
@@ -68,6 +68,7 @@ export async function writeDesktopCache(
 
 export async function removeDesktopAccount(accountId: string) {
   if (!isDesktopRuntime()) return;
+  const { invoke } = await import("@tauri-apps/api/core");
   await invoke("offline_cache_remove_account", { accountId });
 }
 
diff --git a/apps/web/src/desktop-session.ts b/apps/web/src/desktop-session.ts
index d062c18..05899dd 100644
--- a/apps/web/src/desktop-session.ts
+++ b/apps/web/src/desktop-session.ts
@@ -1,4 +1,3 @@
-import { invoke } from "@tauri-apps/api/core";
 import { isDesktopRuntime } from "./desktop-runtime";
 import type { Locale } from "./i18n";
 
@@ -9,6 +8,11 @@ type NativeSession = {
 
 let cachedAccessToken: { token: string; expiresAt: number } | null = null;
 
+async function invokeDesktop<T>(command: string, arguments_?: Record<string, unknown>) {
+  const { invoke } = await import("@tauri-apps/api/core");
+  return arguments_ ? invoke<T>(command, arguments_) : invoke<T>(command);
+}
+
 function cacheToken(session: NativeSession) {
   const encoded = session.accessToken.split(".")[1];
   if (!encoded) return;
@@ -28,7 +32,7 @@ function cacheToken(session: NativeSession) {
 
 export async function nativeRequestHeaders(): Promise<Record<string, string>> {
   if (!isDesktopRuntime()) return {};
-  const installation = await invoke<string>("native_session_identity");
+  const installation = await invokeDesktop<string>("native_session_identity");
   return { "x-mailflow-native": "1", "x-mailflow-installation": installation };
 }
 
@@ -36,14 +40,14 @@ export async function activateDesktopSession(response: Response): Promise<Native
   if (!isDesktopRuntime()) return null;
   const sessionToken = response.headers.get("set-auth-token");
   if (!sessionToken) throw new Error("native_session_missing");
-  const session = await invoke<NativeSession>("native_session_activate", { sessionToken });
+  const session = await invokeDesktop<NativeSession>("native_session_activate", { sessionToken });
   cacheToken(session);
   return session;
 }
 
 export async function currentDesktopSession(): Promise<NativeSession | null> {
   if (!isDesktopRuntime()) return null;
-  const session = await invoke<NativeSession | null>("native_session_current");
+  const session = await invokeDesktop<NativeSession | null>("native_session_current");
   if (session) cacheToken(session);
   else cachedAccessToken = null;
   return session;
@@ -60,7 +64,7 @@ export async function desktopAccessToken(): Promise<string | null> {
 export async function logoutDesktopSession() {
   if (!isDesktopRuntime()) return false;
   try {
-    await invoke("native_session_logout");
+    await invokeDesktop("native_session_logout");
   } finally {
     cachedAccessToken = null;
   }
@@ -70,7 +74,7 @@ export async function logoutDesktopSession() {
 export async function forgetDesktopSession() {
   if (!isDesktopRuntime()) return;
   try {
-    await invoke("native_session_forget_local");
+    await invokeDesktop("native_session_forget_local");
   } finally {
     cachedAccessToken = null;
   }
@@ -78,11 +82,11 @@ export async function forgetDesktopSession() {
 
 export async function beginDesktopPasskey(name: string): Promise<unknown | null> {
   if (!isDesktopRuntime()) return null;
-  return invoke("native_passkey_begin", { name });
+  return invokeDesktop("native_passkey_begin", { name });
 }
 
 export async function finishDesktopPasskey(name: string, response: unknown): Promise<boolean> {
   if (!isDesktopRuntime()) return false;
-  await invoke("native_passkey_finish", { name, response });
+  await invokeDesktop("native_passkey_finish", { name, response });
   return true;
 }
diff --git a/apps/web/src/main.tsx b/apps/web/src/main.tsx
index fb8afaf..4a70267 100644
--- a/apps/web/src/main.tsx
+++ b/apps/web/src/main.tsx
@@ -1,15 +1,32 @@
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
-import { StrictMode } from "react";
+import { lazy, StrictMode, Suspense } from "react";
 import { createRoot } from "react-dom/client";
 import { createBrowserRouter, RouterProvider } from "react-router";
-import { AdminPage } from "./admin-page";
 import { AuthGate } from "./auth-gate";
 import { registerDesktopOfflineShell } from "./desktop-cache";
 import { initializeDesktopRuntime } from "./desktop-runtime";
+import { type Locale, translate } from "./i18n";
 import { AccountsPage, MailPage } from "./pages";
 import { initializeTelemetry } from "./telemetry";
 import "./styles.css";
 
+const AdminPage = lazy(async () => ({ default: (await import("./admin-page")).AdminPage }));
+
+function AdminRoute({ locale }: { locale: Locale }) {
+  return (
+    <Suspense
+      fallback={
+        <main className="mail-state" role="status">
+          <span className="loading-spinner" />
+          <strong>{translate(locale, "admin.loading")}</strong>
+        </main>
+      }
+    >
+      <AdminPage locale={locale} />
+    </Suspense>
+  );
+}
+
 const queryClient = new QueryClient({
   defaultOptions: {
     queries: { staleTime: 30_000, retry: 1 },
@@ -22,10 +39,10 @@ initializeTelemetry();
 
 const router = createBrowserRouter([
   { path: "/", element: <AuthGate renderApp={(locale) => <MailPage initialLocale={locale} />} /> },
-  { path: "/admin", element: <AuthGate renderApp={(locale) => <AdminPage locale={locale} />} /> },
+  { path: "/admin", element: <AuthGate renderApp={(locale) => <AdminRoute locale={locale} />} /> },
   {
     path: "/admin/:section",
-    element: <AuthGate renderApp={(locale) => <AdminPage locale={locale} />} />,
+    element: <AuthGate renderApp={(locale) => <AdminRoute locale={locale} />} />,
   },
   {
     path: "/settings/accounts",
diff --git a/apps/web/src/pages.tsx b/apps/web/src/pages.tsx
index 44e6a30..422de33 100644
--- a/apps/web/src/pages.tsx
+++ b/apps/web/src/pages.tsx
@@ -31,13 +31,21 @@ import {
   Trash2,
   Users,
 } from "lucide-react";
-import { type CSSProperties, useCallback, useEffect, useMemo, useRef, useState } from "react";
+import {
+  type CSSProperties,
+  lazy,
+  Suspense,
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+} from "react";
 import { createPortal } from "react-dom";
 import { useNavigate } from "react-router";
 import { registerPasskey, signOut } from "./auth-client";
 import { Button } from "./components/ui/button";
-import { type ComposeContext, ComposePanel } from "./composer";
-import { ConversationView } from "./conversation";
+import type { ComposeContext } from "./composer";
 import { desktopConnectivityEvent, isDesktopCacheFallback } from "./desktop-cache";
 import {
   listenForNativeExperience,
@@ -86,6 +94,11 @@ import { type SearchSyntaxError, searchSuggestions, validateSearchSyntax } from
 
 type Translator = (key: TranslationKey) => string;
 
+const ComposePanel = lazy(async () => ({ default: (await import("./composer")).ComposePanel }));
+const ConversationView = lazy(async () => ({
+  default: (await import("./conversation")).ConversationView,
+}));
+
 const inboxCategories: Array<{
   id: MailCategory;
   labelKey: TranslationKey;
@@ -1531,25 +1544,34 @@ export function MailPage({ initialLocale = "en" }: { initialLocale?: Locale }) {
         />
         <main className="mail-surface">
           {activeThreadId && activeAccountId ? (
-            <ConversationView
-              accountId={activeAccountId}
-              threadId={activeThreadId}
-              locale={locale}
-              onBack={() => setActiveThreadId(null)}
-              onCompose={(context) => {
-                setComposeContext(context);
-                setComposeOpen(true);
-                setSidebarCollapsed(true);
-              }}
-              onAction={(kind, labelId) => {
-                void runAction(kind, [activeThreadId], labelId);
-                if (kind === "archive" || kind === "move_to_trash") setActiveThreadId(null);
-              }}
-              canActions={canActions}
-              canCompose={canCompose}
-              canAttachments={canAttachments}
-              labelId={actionLabelId}
-            />
+            <Suspense
+              fallback={
+                <div className="mail-state" role="status">
+                  <span className="loading-spinner" />
+                  <strong>{t("loadingConversation")}</strong>
+                </div>
+              }
+            >
+              <ConversationView
+                accountId={activeAccountId}
+                threadId={activeThreadId}
+                locale={locale}
+                onBack={() => setActiveThreadId(null)}
+                onCompose={(context) => {
+                  setComposeContext(context);
+                  setComposeOpen(true);
+                  setSidebarCollapsed(true);
+                }}
+                onAction={(kind, labelId) => {
+                  void runAction(kind, [activeThreadId], labelId);
+                  if (kind === "archive" || kind === "move_to_trash") setActiveThreadId(null);
+                }}
+                canActions={canActions}
+                canCompose={canCompose}
+                canAttachments={canAttachments}
+                labelId={actionLabelId}
+              />
+            </Suspense>
           ) : (
             <>
               <MailToolbar
@@ -1706,17 +1728,26 @@ export function MailPage({ initialLocale = "en" }: { initialLocale?: Locale }) {
         </main>
       </div>
       {composeOpen && activeAccountId && canCompose && (
-        <ComposePanel
-          accountId={activeAccountId}
-          context={composeContext}
-          locale={locale}
-          maximized={composeMaximized}
-          onMaximize={() => setComposeMaximized((value) => !value)}
-          onClose={() => {
-            setComposeOpen(false);
-            setComposeMaximized(false);
-          }}
-        />
+        <Suspense
+          fallback={
+            <div className="compose-panel" role="status">
+              <span className="loading-spinner" />
+              <strong>{t("loadingComposer")}</strong>
+            </div>
+          }
+        >
+          <ComposePanel
+            accountId={activeAccountId}
+            context={composeContext}
+            locale={locale}
+            maximized={composeMaximized}
+            onMaximize={() => setComposeMaximized((value) => !value)}
+            onClose={() => {
+              setComposeOpen(false);
+              setComposeMaximized(false);
+            }}
+          />
+        </Suspense>
       )}
     </div>
   );
diff --git a/services/api/internal/modules/translations/catalogs.json b/services/api/internal/modules/translations/catalogs.json
index e7719cd..6fe13c9 100644
--- a/services/api/internal/modules/translations/catalogs.json
+++ b/services/api/internal/modules/translations/catalogs.json
@@ -95,6 +95,7 @@
     "attachmentFailed": "The attachment could not be downloaded.",
     "displayRemoteImages": "Display remote images",
     "loadingConversation": "Loading conversation…",
+    "loadingComposer": "Loading composer…",
     "conversationFailed": "The conversation could not be loaded.",
     "emptyConversation": "This conversation has no messages.",
     "loadMoreMessages": "Load more messages",
@@ -464,6 +465,7 @@
     "attachmentFailed": "No se ha podido descargar el adjunto.",
     "displayRemoteImages": "Mostrar imágenes remotas",
     "loadingConversation": "Cargando conversación…",
+    "loadingComposer": "Cargando redactor…",
     "conversationFailed": "No se ha podido cargar la conversación.",
     "emptyConversation": "Esta conversación no tiene mensajes.",
     "loadMoreMessages": "Cargar más mensajes",