diff --git a/index.html b/index.html
index 5cb73d5..f51f8d6 100644
--- a/index.html
+++ b/index.html
@@ -39,7 +39,7 @@
       <div class="view-switch" aria-label="视图切换">
         <button class="view-btn active" data-view="binder">活页本</button>
         <button class="view-btn" data-view="timeline">时间轴</button>
-        <button class="view-btn" data-view="globe">地理</button>
+        <button class="view-btn" data-view="globe" disabled title="地理视图加载中">地理</button>
       </div>
     </footer>
 
diff --git a/src/core/App.js b/src/core/App.js
index 9e112d9..59cece7 100644
--- a/src/core/App.js
+++ b/src/core/App.js
@@ -21,6 +21,7 @@ export class App {
     this.timelineSlide = null;
     this.zoomTarget = null;
     this.cameraMemory = {};
+    this._needsRender = true; // 按需渲染：首帧必渲染
 
     this._initRenderer();
     this._initLights();
@@ -36,6 +37,14 @@ export class App {
 
     this._initEvents();
     this._applyRotationLimits(CAMERA_POSES.binder);
+    // 默认新打开时：活页本放到最小（相机沿默认视角拉到最远）
+    {
+      const bp = CAMERA_POSES.binder;
+      const dir = bp.pos.clone().sub(bp.target).normalize();
+      this.camera.position.copy(bp.target).addScaledVector(dir, bp.max);
+      this.controls.target.copy(bp.target);
+      this.controls.update();
+    }
     this._select(0, { syncBinder: false });
     this.binder.syncTo(0);
 
@@ -45,6 +54,13 @@ export class App {
     requestAnimationFrame(this._animate);
   }
 
+  // 首屏加载完成后由 main.js 调用：后台预载地理视图，就绪后激活“地理”按钮
+  preloadGlobe() {
+    const btn = document.querySelector('.view-btn[data-view="globe"]');
+    this.globe.viewerReady.then(() => { if (btn) btn.disabled = false; });
+    this.globe.ensureCreated();
+  }
+
   _initRenderer() {
     const canvas = document.getElementById('scene');
     this.renderer = new THREE.WebGLRenderer({ canvas, antialias: true });
@@ -74,6 +90,7 @@ export class App {
     this.controls.mouseButtons.MIDDLE = -1;
     this.controls.mouseButtons.RIGHT = -1;
     this.controls.rotateSpeed = 0.4; // 整体降速（无边缘减速）
+    this.controls.addEventListener('change', () => { this._needsRender = true; });
     this.controls.update();
   }
 
@@ -84,15 +101,16 @@ export class App {
     const key = new THREE.DirectionalLight(0xffe6c0, 2.4);
     key.position.set(3.2, 4.4, 3.6);
     key.castShadow = true;
-    key.shadow.mapSize.set(1024, 1024);
+    key.shadow.mapSize.set(2048, 2048);
     key.shadow.camera.near = 0.5;
     key.shadow.camera.far = 30;
-    key.shadow.camera.left = -5;
-    key.shadow.camera.right = 5;
-    key.shadow.camera.top = 6;
-    key.shadow.camera.bottom = -6;
-    key.shadow.bias = -0.0002;
+    key.shadow.camera.left = -3.5;
+    key.shadow.camera.right = 3.5;
+    key.shadow.camera.top = 4;
+    key.shadow.camera.bottom = -4;
+    key.shadow.bias = -0.0005;
     this.scene.add(key);
+    this.scene.add(key.target);
     this.keyLight = key;
 
     const rim = new THREE.DirectionalLight(0x8fa0d0, 0.7);
@@ -116,7 +134,7 @@ export class App {
 
     this.timeline = new Timeline();
     this.globe = new CesiumGlobe({ onPick: (i) => this._pickGlobe(i) });
-    this.globe.ensureCreated(); // 打开页面时就渲染缓存好三个视图
+    // Cesium 懒加载：首次进入“地理”视图时才真正创建 viewer
 
     this.scene.add(this.binder.group);
     this.scene.add(this.timeline.group);
@@ -173,6 +191,7 @@ export class App {
     this.raycaster = new THREE.Raycaster();
     this.pointer = new THREE.Vector2();
     this._drag = null;
+    this._hoverDirty = false;
     const canvas = this.renderer.domElement;
 
     const setPointer = (e) => {
@@ -207,11 +226,11 @@ export class App {
           this.timelineOffset = clamp(this._drag.offset + dx * this._worldPerPixel(), -limit, limit);
           this.timeline.group.position.x = this.timelineOffset;
           canvas.style.cursor = 'grabbing';
+          this._needsRender = true;
         }
         return;
       }
-      const hit = this._hitTest();
-      canvas.style.cursor = hit ? 'pointer' : 'grab';
+      this._hoverDirty = true; // 射线检测移到 _animate 中每帧至多执行一次
     });
 
     canvas.addEventListener('pointerup', (e) => {
@@ -271,8 +290,21 @@ export class App {
   }
 
   _hitTest() {
-    const list = this.interactives[this.view];
-    if (!list || !list.length) return null;
+    let list;
+    if (this.view === 'binder') {
+      // 只检测顶层可点击页（左右页 + 翻页缓冲），避免对全部 182 页求交
+      list = [];
+      const cur = this.binder.current;
+      for (let d = -1; d <= 1; d++) {
+        const i = cur + d;
+        if (i >= 0 && i < this.binder.pages.length) list.push(this.binder.pages[i].mesh);
+      }
+    } else if (this.view === 'timeline') {
+      list = this.timeline.pickableMeshes();
+    } else {
+      return null; // 地理视图由 Cesium 自行拾取
+    }
+    if (!list.length) return null;
     this.raycaster.setFromCamera(this.pointer, this.camera);
     const hits = this.raycaster.intersectObjects(list, false);
     return hits.length ? hits[0] : null;
@@ -331,10 +363,13 @@ export class App {
     this.globe.setSelected(this.selected);
     if (this.view === 'globe') this.globe.flyToEntry(this.selected); // 地球页切换时自动居中
     if (syncBinder) this.binder.syncTo(this.selected);
+    this._needsRender = true;
   }
 
   switchView(view) {
     if (view === this.view || !CAMERA_POSES[view]) return;
+    // 地理视图尚未就绪（按钮仍置灰）时忽略切换，键盘也无法绕过
+    if (view === 'globe' && !this.globe.viewer) return;
     // 离开当前视图前，记住它的相机位置
     if (this.view !== 'globe') {
       this.cameraMemory[this.view] = {
@@ -416,6 +451,7 @@ export class App {
         this.controls.target.copy(pose.target);
       }
     }
+    this._needsRender = true;
   }
 
   _applyRotationLimits(pose) {
@@ -449,16 +485,27 @@ export class App {
     this.camera.updateProjectionMatrix();
     this.renderer.setSize(window.innerWidth, window.innerHeight);
     if (this.globe) this.globe.resize();
+    this._needsRender = true;
   }
 
   _animate() {
     requestAnimationFrame(this._animate);
     const dt = Math.min(this.clock.getDelta(), 0.05);
 
+    // 是否有进行中的动画（决定本帧是否需要重绘）
+    const animating =
+      this.binder.flip !== null ||
+      this.timeline.hasActiveFlip() ||
+      this.cameraTween !== null ||
+      this.zoomTarget !== null ||
+      this.timelineSlide !== null;
+    if (animating) this._needsRender = true;
+
     this.binder.update(dt);
     this.timeline.update(dt);
     this.timeline.drainPending();
     this._updateTimelineTextures();
+    if (this.timeline.consumeDirty()) this._needsRender = true;
 
     if (this.cameraTween) {
       const t = this.cameraTween;
@@ -492,7 +539,19 @@ export class App {
       if (k >= 1) this.timelineSlide = null;
     }
 
+    // 鼠标悬停检测：每帧至多一次（pointermove 高频事件被合帧）
+    if (this._hoverDirty) {
+      this._hoverDirty = false;
+      const hit = this._hitTest();
+      this.renderer.domElement.style.cursor = hit ? 'pointer' : 'grab';
+    }
+
     this.controls.update();
-    this.renderer.render(this.scene, this.camera);
+
+    // 按需渲染：仅在状态/动画/交互变化时重绘，静止时停止渲染
+    if (this._needsRender) {
+      this._needsRender = false;
+      this.renderer.render(this.scene, this.camera);
+    }
   }
 }
diff --git a/src/main.js b/src/main.js
index 2362535..042765e 100644
--- a/src/main.js
+++ b/src/main.js
@@ -9,15 +9,16 @@ for (const ev of ['copy', 'cut', 'contextmenu']) {
 const app = new App();
 window.__app = app; // 便于调试
 
-// 加载界面：等三个视图初始化完成（最少展示 1 秒，最多等 8 秒）后淡出
+// 加载界面：等首帧渲染后立即后台预载地理视图（与 loading 并行，不等其淡出）；
+// loading 最少展示 3 秒（期间 Cesium 预载已同步进行）。
 const t0 = Date.now();
-const MIN_DISPLAY = 1000;
-Promise.race([
-  app.globe.ready,
-  new Promise((r) => setTimeout(r, 8000)),
-]).then(() => {
-  const wait = Math.max(0, MIN_DISPLAY - (Date.now() - t0));
-  setTimeout(() => {
-    document.getElementById('loading').classList.add('hidden');
-  }, wait);
+const MIN_DISPLAY = 8000;
+requestAnimationFrame(() => {
+  requestAnimationFrame(() => {
+    app.preloadGlobe(); // 首帧已渲染，立即预载地理界面
+    const wait = Math.max(0, MIN_DISPLAY - (Date.now() - t0));
+    setTimeout(() => {
+      document.getElementById('loading').classList.add('hidden');
+    }, wait);
+  });
 });
diff --git a/src/scene/CesiumGlobe.js b/src/scene/CesiumGlobe.js
index 9cfbe10..b3c08dd 100644
--- a/src/scene/CesiumGlobe.js
+++ b/src/scene/CesiumGlobe.js
@@ -124,13 +124,20 @@ export class CesiumGlobe {
     this._visible = false;
     this._pendingData = 2; // 国家边界 + 城市数据
     this.ready = new Promise((resolve) => { this._resolveReady = resolve; });
+    this.viewerReady = new Promise((resolve) => { this._resolveViewerReady = resolve; });
   }
 
   async ensureCreated() {
     if (this._created) return;
     this._created = true;
 
-    await loadCesium();
+    try {
+      await loadCesium();
+    } catch (err) {
+      this._created = false; // 失败可重试
+      console.warn('[CesiumGlobe] Cesium 脚本加载失败：', err);
+      return;
+    }
 
     // 调整实体渲染顺序：先渲染标签（城市/国家名），再渲染 Billboard（标记便签），
     // 让词条标记始终显示在城市/国家名的上层。
@@ -255,6 +262,12 @@ export class CesiumGlobe {
     this.setVisible(this._visible);
     this.resize();
     this.flyToEntry(this.selected);
+
+    // 地球已就绪（影像/地形/城市数据继续后台加载），通知 App 隐藏加载遮罩
+    if (this._resolveViewerReady) {
+      this._resolveViewerReady();
+      this._resolveViewerReady = null;
+    }
   }
 
   _buildMarkers() {
diff --git a/src/scene/binder.js b/src/scene/binder.js
index 06d6e9b..a9babb6 100644
--- a/src/scene/binder.js
+++ b/src/scene/binder.js
@@ -5,7 +5,7 @@ import { clamp, easeOutCubic } from '../utils/easing.js';
 
 const RING_R = 0.085;
 const RING_TUBE = 0.0115;
-const STACK_GAP = 0.004;
+const STACK_GAP = 0.002;
 const PAGE_GAP = 0.02; // 页内缘离书脊的小空隙
 
 function makeLeatherTexture({ emblem = false } = {}) {
@@ -533,7 +533,7 @@ export class Binder {
   flipForward() {
     if (this.flip) this._finalizeFlip(); // 前一页没翻完也能继续翻
     if (!this.canFlipForward()) return;
-    this.flip = { index: this.current, from: 0, to: -Math.PI, t: 0, duration: 0.6 };
+    this.flip = { index: this.current, from: 0, to: -Math.PI, t: 0, duration: 0.38 };
     // 优先更新底部导航与信息卡（翻页开始即切换目标页）
     if (this.onChange) this.onChange((this.current + 1) % this.pages.length);
   }
@@ -541,7 +541,7 @@ export class Binder {
   flipBackward() {
     if (this.flip) this._finalizeFlip();
     if (!this.canFlipBackward()) return;
-    this.flip = { index: this.current - 1, from: -Math.PI, to: 0, t: 0, duration: 0.6 };
+    this.flip = { index: this.current - 1, from: -Math.PI, to: 0, t: 0, duration: 0.38 };
     // 优先更新底部导航与信息卡
     if (this.onChange) this.onChange(this.current - 1);
   }
diff --git a/src/scene/timeline.js b/src/scene/timeline.js
index 0451da0..fc6d07a 100644
--- a/src/scene/timeline.js
+++ b/src/scene/timeline.js
@@ -27,6 +27,7 @@ export class Timeline {
     this._visRange = null;
     this._ready = false;
     this._pending = [];
+    this._dirty = false;
 
     this._buildLine();
     this._buildCards();
@@ -141,17 +142,21 @@ export class Timeline {
       c.material.setPageMaps(this.placeholder.front, this.placeholder.back);
       c.isPlaceholder = true;
       this._textured.delete(i);
+      this._dirty = true;
     }
 
     // 进入窗口：分帧异步生成，避免一次性生成 25 页阻塞主线程
-    this._pending = [...win].filter((i) => !this._textured.has(i) && this.cards[i].isPlaceholder);
+    const next = [...win].filter((i) => !this._textured.has(i) && this.cards[i].isPlaceholder);
+    if (next.length) this._dirty = true;
+    this._pending = next;
     this.drainPending();
   }
 
   // 每帧由 App._animate 驱动，逐批生成窗口内纹理（避免阻塞）
   drainPending() {
-    if (!this._pending || !this._pending.length) return;
+    if (!this._pending || !this._pending.length) return false;
     const budget = 2; // 每帧最多生成 2 页
+    let did = false;
     for (let k = 0; k < budget && this._pending.length; k++) {
       const i = this._pending.shift();
       const c = this.cards[i];
@@ -160,7 +165,21 @@ export class Timeline {
       c.material.setPageMaps(front, back);
       c.isPlaceholder = false;
       this._textured.add(i);
+      this._dirty = true;
+      did = true;
     }
+    return did;
+  }
+
+  hasActiveFlip() {
+    return this.cards.some((c) => c.flipAnim);
+  }
+
+  // App 每帧消费“纹理窗口变化”标志，用于按需渲染
+  consumeDirty() {
+    const d = this._dirty;
+    this._dirty = false;
+    return d;
   }
 
   // 返回某张卡片在时间轴组内的横向坐标（用于点击后居中）
@@ -168,6 +187,16 @@ export class Timeline {
     return cardX(index, ENTRIES.length);
   }
 
+  // 射线检测用：只返回可视窗口内的卡片 mesh（减少求交对象）
+  pickableMeshes() {
+    if (!this._visRange) return this.cards.map((c) => c.mesh);
+    const list = [];
+    for (let i = this._visRange.min; i <= this._visRange.max; i++) {
+      if (this.cards[i]) list.push(this.cards[i].mesh);
+    }
+    return list;
+  }
+
   // 点击翻转：每次点击切换正/反面；选中另一张时，其它翻到背面的卡片先翻回正面
   flip(index) {
     this.cards.forEach((o) => {
diff --git a/src/styles.css b/src/styles.css
index 5e10d29..c4e49ed 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -55,7 +55,7 @@ html, body {
 .vignette {
   position: absolute; inset: 0; pointer-events: none;
   background: radial-gradient(ellipse at 50% 42%, transparent 40%, rgba(8, 5, 3, 0.55) 100%);
-  mix-blend-mode: multiply;
+  /* 不启用 mix-blend-mode，避免每帧全屏合成开销（深色半透明覆盖即可） */
 }
 .grain {
   position: absolute; inset: 0; pointer-events: none; opacity: 0.06;
@@ -114,6 +114,11 @@ html, body {
   transition: all 0.25s ease;
 }
 .view-btn:hover { border-color: var(--gold); color: #fff; }
+.view-btn:disabled {
+  opacity: 0.45;
+  cursor: not-allowed;
+  pointer-events: none;
+}
 .view-btn.active {
   background: linear-gradient(180deg, rgba(201,162,39,0.85), rgba(150,115,20,0.85));
   color: #1c1308; border-color: var(--gold); font-weight: 600;
diff --git a/vite.config.js b/vite.config.js
index e0d4b1c..a634b25 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,6 +1,42 @@
 import { defineConfig } from 'vite';
-import cesium from 'vite-plugin-cesium';
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import serveStatic from 'serve-static';
+
+// Cesium 懒加载：复制静态资源、注入 CSS，但不注入 6MB 的 Cesium.js 脚本——
+// 脚本由 CesiumGlobe 首次进入“地理”视图时动态加载，避免阻塞首屏。
+const CESIUM_URL = '/cesium/';
+
+function cesiumLazy() {
+  let isBuild = false;
+  return {
+    name: 'cesium-lazy',
+    config(_c, { command }) {
+      isBuild = command === 'build';
+    },
+    configureServer({ middlewares }) {
+      // dev：直接静态服务 Cesium 资源（未压缩版便于调试）
+      const dir = path.join(process.cwd(), 'node_modules/cesium/Build/CesiumUnminified');
+      middlewares.use(CESIUM_URL, serveStatic(dir));
+    },
+    async closeBundle() {
+      if (!isBuild) return;
+      const src = path.join(process.cwd(), 'node_modules/cesium/Build/Cesium');
+      const out = path.join(process.cwd(), 'dist', 'cesium');
+      for (const d of ['Assets', 'ThirdParty', 'Workers', 'Widgets']) {
+        await fs.cp(path.join(src, d), path.join(out, d), { recursive: true });
+      }
+      await fs.copyFile(path.join(src, 'Cesium.js'), path.join(out, 'Cesium.js'));
+    },
+    transformIndexHtml() {
+      return [{
+        tag: 'link',
+        attrs: { rel: 'stylesheet', href: `${CESIUM_URL}Widgets/widgets.css` },
+      }];
+    },
+  };
+}
 
 export default defineConfig({
-  plugins: [cesium()],
+  plugins: [cesiumLazy()],
 });