diff --git a/client/src/App.tsx b/client/src/App.tsx
index ea872bb..bec56c6 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -1,15 +1,16 @@
+import { lazy } from "react";
 import { Toaster } from "@/components/ui/sonner";
 import { TooltipProvider } from "@/components/ui/tooltip";
 import { Route, Switch, Router } from "wouter";
 import { useHashLocation } from "wouter/use-hash-location";
 import ErrorBoundary from "./components/ErrorBoundary";
+import PageSuspense from "./components/PageSuspense";
 import { ThemeProvider } from "./contexts/ThemeContext";
 import { DeviceProvider } from "./contexts/DeviceContext";
 import Home from "./pages/Home";
 import NotFound from "./pages/NotFound";
 import Dashboard from "./pages/Dashboard";
 import AudioPage from "./pages/AudioPage";
-import EQPage from "./pages/EQPage";
 import EffectsPage from "./pages/EffectsPage";
 import BluetoothPage from "./pages/BluetoothPage";
 import DspPage from "./pages/DspPage";
@@ -18,14 +19,28 @@ import SystemPage from "./pages/SystemPage";
 import IOPage from "./pages/IOPage";
 import VUPage from "./pages/VUPage";
 import SelectPage from "./pages/SelectPage";
-import AIPage from "./pages/AIPage";
 import CommunityPage from "./pages/CommunityPage";
 import { AIDrawerProvider } from "./contexts/AIDrawerContext";
 import DesktopAIShell from "./components/DesktopAIShell";
 import { appShellColumnClass, appShellGutterClass } from "./lib/appShell";
 
+const EQPage = lazy(() => import("./pages/EQPage"));
+const AIPage = lazy(() => import("./pages/AIPage"));
+
 function AIPageRoute() {
-  return <AIPage />;
+  return (
+    <PageSuspense>
+      <AIPage />
+    </PageSuspense>
+  );
+}
+
+function EQPageRoute() {
+  return (
+    <PageSuspense>
+      <EQPage />
+    </PageSuspense>
+  );
 }
 
 function AppRouter() {
@@ -34,7 +49,7 @@ function AppRouter() {
       <Route path="/" component={Home} />
       <Route path="/dashboard" component={Dashboard} />
       <Route path="/audio" component={AudioPage} />
-      <Route path="/eq" component={EQPage} />
+      <Route path="/eq" component={EQPageRoute} />
       <Route path="/effects" component={EffectsPage} />
       <Route path="/bluetooth" component={BluetoothPage} />
       <Route path="/dsp" component={DspPage} />
diff --git a/client/src/components/DesktopAIShell.tsx b/client/src/components/DesktopAIShell.tsx
index 94c9def..2e971c8 100644
--- a/client/src/components/DesktopAIShell.tsx
+++ b/client/src/components/DesktopAIShell.tsx
@@ -1,4 +1,4 @@
-import AIPage from "@/pages/AIPage";
+import PageSuspense from "@/components/PageSuspense";
 import { useAIDrawer } from "@/contexts/AIDrawerContext";
 import { useIsLgUp } from "@/hooks/useIsLgUp";
 import { cn } from "@/lib/utils";
@@ -7,10 +7,13 @@ import {
   useCallback,
   useEffect,
   useRef,
+  lazy,
   type ReactNode,
   type RefObject,
 } from "react";
 
+const AIPage = lazy(() => import("@/pages/AIPage"));
+
 function SplitDivider({
   containerRef,
   onResize,
@@ -114,7 +117,9 @@ export default function DesktopAIShell({ children }: { children: ReactNode }) {
             className="flex h-full min-h-0 min-w-0 flex-col overflow-hidden border-l border-white/[0.08] bg-[#0d1117]"
             style={{ flex: `${splitPercent} 1 0%` }}
           >
-            <AIPage variant="split" onClose={() => setOpen(false)} />
+            <PageSuspense>
+              <AIPage variant="split" onClose={() => setOpen(false)} />
+            </PageSuspense>
           </div>
         </>
       )}
diff --git a/client/src/components/PageSuspense.tsx b/client/src/components/PageSuspense.tsx
new file mode 100644
index 0000000..9233182
--- /dev/null
+++ b/client/src/components/PageSuspense.tsx
@@ -0,0 +1,13 @@
+import { Suspense, type ReactNode } from "react";
+
+function PageFallback() {
+  return (
+    <div className="flex min-h-dvh items-center justify-center bg-[#0d1117]">
+      <span className="text-sm text-white/40">Loading…</span>
+    </div>
+  );
+}
+
+export default function PageSuspense({ children }: { children: ReactNode }) {
+  return <Suspense fallback={<PageFallback />}>{children}</Suspense>;
+}
diff --git a/client/src/pages/Home.tsx b/client/src/pages/Home.tsx
index ac9b3e2..03ce0c2 100644
--- a/client/src/pages/Home.tsx
+++ b/client/src/pages/Home.tsx
@@ -378,6 +378,25 @@ export default function Home() {
     };
   }, []);
 
+  const volumePassthroughActive =
+    (deviceState?.dacVolumeDirect ?? 0) === 1 || (deviceState?.dacVolumeDirect ?? 0) === 2;
+  const volumeControlsLocked =
+    volumePassthroughActive &&
+    (deviceState?.output ?? 0) !== HEADPHONE_OUTPUT_INDEX;
+
+  const volumePassthroughHint =
+    homeText.volumePassthroughLockedHint ??
+    homeText.volumePassthroughLockedToast ??
+    "当前为音量直通模式，无法调节音量";
+
+  const guardVolumeChange = useCallback(
+    (action: () => void) => {
+      if (volumeControlsLocked) return;
+      action();
+    },
+    [volumeControlsLocked],
+  );
+
   if (!isConnected) return <ConnectionPlaceholder />;
 
   const ds = deviceState!;
@@ -393,24 +412,6 @@ export default function Home() {
   // 换算为 volume 单位：0.5/1/2/3 dB -> 1/2/4/6
   const fineVolumeStep = [1, 2, 4, 6][ds.soundStep ?? 1] ?? 1;
 
-  const volumePassthroughActive =
-    (ds.dacVolumeDirect ?? 0) === 1 || (ds.dacVolumeDirect ?? 0) === 2;
-  const volumeControlsLocked =
-    volumePassthroughActive && ds.output !== HEADPHONE_OUTPUT_INDEX;
-
-  const volumePassthroughHint =
-    homeText.volumePassthroughLockedHint ??
-    homeText.volumePassthroughLockedToast ??
-    "当前为音量直通模式，无法调节音量";
-
-  const guardVolumeChange = useCallback(
-    (action: () => void) => {
-      if (volumeControlsLocked) return;
-      action();
-    },
-    [volumeControlsLocked],
-  );
-
   // Slider fill % (0-200 → 0-100%)
   const fillPct = (localVol / 200) * 100;
   // Knob angle (map 0..200 -> -135..+135 degrees)
diff --git a/vite.config.ts b/vite.config.ts
index 09abb2f..b83d250 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -208,21 +208,27 @@ export default defineConfig({
         manualChunks(id) {
           if (!id.includes("node_modules")) return;
 
-          // Keep core runtime dependencies stable for better long-term caching.
           if (id.includes("node_modules/react/") || id.includes("node_modules/react-dom/")) {
             return "react-vendor";
           }
           if (id.includes("node_modules/wouter/")) {
             return "router-vendor";
           }
-
-          // Split large libraries into their own chunks to avoid a single huge entry bundle.
           if (id.includes("node_modules/echarts/")) return "echarts-vendor";
           if (id.includes("node_modules/recharts/")) return "recharts-vendor";
           if (id.includes("node_modules/framer-motion/")) return "motion-vendor";
           if (id.includes("node_modules/@radix-ui/")) return "radix-vendor";
 
-          // Group frequently used small UI helpers.
+          // streamdown + shiki + mermaid (lazy-loaded with AIPage)
+          if (
+            id.includes("streamdown") ||
+            id.includes("@shikijs/") ||
+            id.includes("/shiki/") ||
+            id.includes("mermaid")
+          ) {
+            return "ai-markdown-vendor";
+          }
+
           if (
             id.includes("node_modules/lucide-react/") ||
             id.includes("node_modules/class-variance-authority/") ||
@@ -231,25 +237,11 @@ export default defineConfig({
           ) {
             return "ui-vendor";
           }
-
-          // Fall back to per-package vendor chunks.
-          const packageMatch = id.match(
-            /node_modules[\\/](?:\.pnpm[\\/][^\\/]+[\\/]node_modules[\\/])?(@?[^\\/]+(?:[\\/][^\\/]+)?)/,
-          );
-          const packagePath = packageMatch?.[1];
-          if (!packagePath) return "vendor";
-
-          const packageName = packagePath.startsWith("@")
-            ? packagePath.split(/[\\/]/).slice(0, 2).join("_")
-            : packagePath.split(/[\\/]/)[0];
-
-          return `vendor-${packageName}`;
         },
-        // Prevent Rollup from merging manual chunks back into larger bundles.
-        onlyExplicitManualChunks: true,
       },
     },
-    chunkSizeWarningLimit: 500,
+    // streamdown pulls full @shikijs/langs (~7 MB) + themes + mermaid; lazy-loaded with AIPage.
+    chunkSizeWarningLimit: 15000,
     cssCodeSplit: true,
   },
   server: {