diff --git a/packages/website/index.html b/packages/website/index.html
index f6a5cd9..7e591c9 100644
--- a/packages/website/index.html
+++ b/packages/website/index.html
@@ -45,13 +45,24 @@
 		</script>
 	</head>
 	<body>
-		<div id="root"></div>
+		<div id="root">
+			<div id="sk">
+				<p class="sk-text" id="sk-text">Loading...</p>
+				<style>
+					#sk{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#eff6ff,#f5f3ff)}
+					@media(prefers-color-scheme:dark){#sk{background:linear-gradient(135deg,#111827,#1f2937)}}
+					.sk-text{font:400 14px/1 system-ui,sans-serif;color:#94a3b8;animation:skf 2s ease-in-out infinite}
+					@keyframes skf{0%,100%{opacity:.6}50%{opacity:.3}}
+				</style>
+			</div>
+		</div>
 		<script type="module" src="./src/main.tsx"></script>
 		<script>
-			// Dynamically update html lang attribute based on i18n detection
 			const updateHtmlLang = () => {
 				const lang = localStorage.getItem('i18nextLng') || navigator.language || 'zh-CN'
 				document.documentElement.lang = lang
+				const el = document.getElementById('sk-text')
+				if (el) el.textContent = lang.startsWith('zh') ? '加载中...' : 'Loading...'
 			}
 			updateHtmlLang()
 			window.addEventListener('storage', updateHtmlLang)
diff --git a/packages/website/src/pages/home/HeroSection.tsx b/packages/website/src/pages/home/HeroSection.tsx
index fd5e381..162bdbd 100644
--- a/packages/website/src/pages/home/HeroSection.tsx
+++ b/packages/website/src/pages/home/HeroSection.tsx
@@ -1,5 +1,5 @@
 /* eslint-disable react-dom/no-dangerously-set-innerhtml */
-import { PageAgent } from 'page-agent'
+import type { PageAgent as PageAgentType } from 'page-agent'
 import { useEffect, useState } from 'react'
 import { Link, useSearchParams } from 'wouter'
 
@@ -16,6 +16,8 @@ import {
 } from '../../constants'
 import { useLanguage } from '../../i18n/context'
 
+const pageAgentModule = import('page-agent')
+
 function getInjection(useCN?: boolean) {
 	const cdn = useCN ? CDN_DEMO_CN_URL : CDN_DEMO_URL
 
@@ -55,13 +57,19 @@ export default function HeroSection() {
 	const [activeTab, setActiveTab] = useState<'try' | 'other'>(isOther ? 'other' : 'try')
 	const [cdnSource, setCdnSource] = useState<'international' | 'china'>('international')
 
-	const handleExecute = async () => {
-		if (!task.trim()) return
+	const [ready, setReady] = useState(false)
+	useEffect(() => {
+		pageAgentModule.then(() => setReady(true))
+	}, [])
 
+	const handleExecute = async () => {
+		if (!task.trim() || !ready) return
+
+		const { PageAgent } = await pageAgentModule
 		const win = window as any
 
 		if (!win.pageAgent || win.pageAgent.disposed) {
-			win.pageAgent = new PageAgent({
+			win.pageAgent = new (PageAgent as typeof PageAgentType)({
 				interactiveBlacklist: [document.getElementById('root')!],
 				language: language,
 
@@ -208,10 +216,21 @@ export default function HeroSection() {
 												/>
 												<button
 													onClick={handleExecute}
+													disabled={!ready}
 													className="absolute right-2 top-2 px-5 py-1.5 bg-linear-to-r from-blue-600 to-purple-600 text-white font-medium rounded-md hover:shadow-md transform hover:scale-105 transition-all duration-200 disabled:opacity-50 disabled:cursor-not-allowed disabled:transform-none text-sm"
 													data-page-agent-not-interactive
 												>
-													{isZh ? '执行' : 'Run'}
+													{ready ? (
+														isZh ? (
+															'执行'
+														) : (
+															'Run'
+														)
+													) : (
+														<span className="animate-pulse">
+															{isZh ? '准备中...' : 'Preparing...'}
+														</span>
+													)}
 												</button>
 											</div>
 											<p className="text-xs text-gray-500 dark:text-gray-400 text-left">
diff --git a/packages/website/src/router.tsx b/packages/website/src/router.tsx
index 87271c7..9ba948a 100644
--- a/packages/website/src/router.tsx
+++ b/packages/website/src/router.tsx
@@ -1,10 +1,18 @@
-import { Suspense, useLayoutEffect } from 'react'
+import { Suspense, lazy, useLayoutEffect } from 'react'
 import { Route, Switch, useLocation } from 'wouter'
 
 import Footer from './components/Footer'
 import Header from './components/Header'
+import { useLanguage } from './i18n/context'
 import HomePage from './pages/Home'
-import DocsPages from './pages/docs/index'
+import DocsLayout from './pages/docs/Layout'
+
+const DocsPages = lazy(() => import('./pages/docs/index'))
+
+// Prefetch docs chunk during idle time so navigation feels instant
+if (typeof requestIdleCallback !== 'undefined') {
+	requestIdleCallback(() => import('./pages/docs/index'))
+}
 
 function ScrollToTop() {
 	const [pathname] = useLocation()
@@ -14,6 +22,18 @@ function ScrollToTop() {
 	return null
 }
 
+function DocsLoadingFallback() {
+	const { isZh } = useLanguage()
+	return (
+		<DocsLayout>
+			<div className="flex items-center gap-3 py-12 text-gray-500 dark:text-gray-400">
+				<div className="w-5 h-5 border-2 border-blue-500 border-t-transparent rounded-full animate-spin" />
+				{isZh ? '文档加载中...' : 'Loading documentation...'}
+			</div>
+		</DocsLayout>
+	)
+}
+
 export default function Router() {
 	return (
 		<div className="flex min-h-screen flex-col">
@@ -32,7 +52,9 @@ export default function Router() {
 
 					<Route path="/docs" nest>
 						<div className="flex-1 bg-white dark:bg-gray-900">
-							<DocsPages />
+							<Suspense fallback={<DocsLoadingFallback />}>
+								<DocsPages />
+							</Suspense>
 						</div>
 					</Route>
 
diff --git a/packages/website/vite.config.js b/packages/website/vite.config.js
index 601ff87..fc1d514 100644
--- a/packages/website/vite.config.js
+++ b/packages/website/vite.config.js
@@ -64,6 +64,12 @@ export default defineConfig(({ mode }) => ({
 				if (message.code === 'EVAL') return
 				handler(message)
 			},
+			output: {
+				manualChunks: {
+					vendor: ['react', 'react-dom', 'wouter'],
+					'page-agent': ['page-agent'],
+				},
+			},
 		},
 	},
 	resolve: {
