diff --git a/demo/App.vue b/demo/App.vue
index 1d242e1..274e52b 100644
--- a/demo/App.vue
+++ b/demo/App.vue
@@ -1,13 +1,15 @@
 <template>
   <div>
-    <button @click="handleSwitchUrl('test1')">switch url 1</button>
-    <button @click="handleSwitchUrl('test2')">switch url 2</button>
-    <button @click="handleSwitchUrl('base64')">switch base64</button>
-    <PDFViewer
-      :source="pdfSource"
-      style="height: 100vh; width: 100%"
-      @download="handleDownload"
-    />
+    <div>
+      switch url
+
+      <button @click="handleSwitchUrl('test1')">switch url 1</button>
+      <button @click="handleSwitchUrl('test2')">switch url 2</button>
+      <button @click="handleSwitchUrl('base64')">switch base64</button>
+    </div>
+    <div style="height: calc(100vh -  30px); width: 80%; margin: 0 auto">
+      <PDFViewer :source="pdfSource" @download="handleDownload" />
+    </div>
   </div>
 </template>
 
@@ -15,7 +17,8 @@
 import PDFViewer from '../src/index.js'
 
 const TEST_URL_MAP = {
-  test1: 'https://raw.githubusercontent.com/DingRui12138/vue-pdf-viewer/master/demo/static/pdf/helloworld.pdf',
+  test1:
+    'https://raw.githubusercontent.com/DingRui12138/vue-pdf-viewer/master/demo/static/pdf/helloworld.pdf',
   test2:
     'https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/web/compressed.tracemonkey-pldi-09.pdf',
   base64: `data:application/octet-stream;base64,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`,
@@ -27,7 +30,7 @@ export default {
   },
   data() {
     return {
-      pdfSource: TEST_URL_MAP.test2,
+      pdfSource: TEST_URL_MAP.test1,
     }
   },
   methods: {
diff --git a/src/PDFViewer.vue b/src/PDFViewer.vue
index 4b0b9ce..aba2497 100644
--- a/src/PDFViewer.vue
+++ b/src/PDFViewer.vue
@@ -1,6 +1,6 @@
 <template>
   <div class="pdf-viewer" @contextmenu="handlePreventDefault">
-    <div class="pdf-viewer__header">
+    <div class="pdf-viewer__header" :class="{ 'not-ready': !isReady }">
       <ViewerPageSelector
         :total="total"
         :page.sync="page"
@@ -9,6 +9,7 @@
         :rotate.sync="rotate"
         :isFullpage="isFullpage"
         :filename="filename"
+        :isReady="isReady"
         @toggleFullpage="handleToggleFullpage"
         @update:zoom="handleUpdateZoom"
         @toggleCatalog="handleToggleCatalog"
@@ -18,9 +19,16 @@
     </div>
 
     <div class="pdf-viewer__body">
-      <div class="loading-mask" v-if="isLoading">
+      <div class="loading-mask" v-if="isLoading || isRendering">
         <slot name="loading">
-          <div class="loading-content">Loading {{dotText}}</div>
+          <div class="loading-content" v-if="isLoading">
+            {{ loadingContent }}
+          </div>
+        </slot>
+        <slot name="rendering">
+          <div class="rendering-content" v-if="isRendering">
+            {{ renderingContent }}
+          </div>
         </slot>
       </div>
       <Viewer
@@ -36,6 +44,7 @@
         :filename.sync="filename"
         @update:zoom="handleUpdateZoom"
         @update:isLoading="handleUpdateLoadingState"
+        @update:isRendering="handleUpdateRenderingState"
         @password-requested="handlePasswordRequest"
         @loaded="handleLoaded"
         @loading-failed="handleLoadingFailed"
@@ -83,6 +92,7 @@ export default {
   data() {
     return {
       isLoading: true,
+      isRendering: false,
       page: 1,
       total: 1,
       catalogVisible: true,
@@ -94,8 +104,20 @@ export default {
     }
   },
   computed: {
+    isReady() {
+      return !this.isLoading && !this.isRendering
+    },
+    status() {
+      return [this.isLoading, this.isRendering]
+    },
+    loadingContent() {
+      return `${this.loadingText || 'Loading'} ${this.dotText}`
+    },
+    renderingContent() {
+      return `${this.renderingText || 'Rendering'} ${this.dotText}`
+    },
     dotText() {
-      const len = this.seconds % 3 + 1
+      const len = (this.seconds % 3) + 1
       const dot = '.'
 
       return dot.repeat(len)
@@ -106,9 +128,36 @@ export default {
       }
     },
   },
+  watch: {
+    status: {
+      handler(n) {
+        const [isLoading, isRendering] = n
+        const startTimer = () => {
+          this._timer && clearInterval(this._timer)
+          this.seconds = 0
+
+          this._timer = setInterval(() => {
+            this.seconds += 1
+          }, 500)
+        }
+
+        if (isLoading) {
+          if (this.$slots.loading) return
+          startTimer()
+        } else if (isRendering) {
+          if (this.$slots.rendering) return
+          startTimer()
+        }
+      },
+    },
+    deep: true,
+  },
   methods: {
     handleDownload() {
-      this.$emit('download', this.source)
+      this.$emit('download', {
+        src: this.source,
+        filename: this.filename,
+      })
     },
     handlePrint() {
       this.$refs.viewer.print()
@@ -134,22 +183,16 @@ export default {
 
       this.total = total
       this.$emit('loaded', params)
+      this.isLoading = false
     },
     handleDocumentRender() {
-      this.isLoading = false
       this.$emit('rendered')
     },
+    handleUpdateRenderingState(isRendering) {
+      this.isRendering = isRendering
+    },
     handleUpdateLoadingState(isLoading) {
       this.isLoading = isLoading
-      
-      if (this.$slots.loading) return
-      this._timer && clearInterval(this._timer)
-      if (isLoading) {
-        this.seconds = 0
-        this._timer = setInterval(() => {
-          this.seconds += 1
-        }, 500)
-      }
     },
     handlePasswordRequest({ callback, retry }) {
       // TODO: slot dialog ?
@@ -207,6 +250,17 @@ export default {
     padding: 0 16px;
     box-shadow: 0px 3px 10px 2px black;
     z-index: 999;
+    &.not-ready {
+      position: relative;
+      &::after {
+        content: '';
+        height: 100%;
+        width: 100%;
+        display: inline-block;
+        position: absolute;
+        z-index: 1;
+      }
+    }
   }
 
   &__body {
@@ -222,7 +276,9 @@ export default {
       height: 100%;
       width: 100%;
       pointer-events: none;
-      .loading-content {
+      background: #a9a9a9;
+      .loading-content,
+      .rendering-content {
         height: 100%;
         width: 100%;
         display: flex;
diff --git a/src/components/RotateWrapper/RotateWrapper.scss b/src/components/RotateWrapper/RotateWrapper.scss
new file mode 100644
index 0000000..03ec840
--- /dev/null
+++ b/src/components/RotateWrapper/RotateWrapper.scss
@@ -0,0 +1,15 @@
+.rotate-wrapper {
+  display: inline-block;
+  position: relative;
+  width: 100%;
+  .image {
+    position: absolute;
+    width: 100%;
+  }
+  &::after {
+    content: '';
+    width: var(--content-width);
+    height: var(--content-height);
+    display: inline-block;
+  }
+}
diff --git a/src/components/RotateWrapper/RotateWrapper.vue b/src/components/RotateWrapper/RotateWrapper.vue
new file mode 100644
index 0000000..59dc67a
--- /dev/null
+++ b/src/components/RotateWrapper/RotateWrapper.vue
@@ -0,0 +1,79 @@
+<template>
+  <div class="rotate-wrapper" :style="loaded && contentStyle">
+    <!-- TODO: slot content (MutationObserver) -->
+    <img
+      v-if="src"
+      class="image"
+      ref="img"
+      :src="src"
+      :style="imageStyle"
+      @load="handleLoaded"
+    />
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'RotateWrapper',
+  props: {
+    src: String,
+    rotateDeg: Number,
+    duration: {
+      type: Number,
+      default: 0,
+    },
+  },
+  data() {
+    return {
+      loaded: false,
+      imageRect: {},
+    }
+  },
+  computed: {
+    contentStyle() {
+      return {
+        '--content-width': `${this.imageRect.width}px`,
+        '--content-height': `${this.imageRect.height}px`,
+      }
+    },
+    imageStyle() {
+      return {
+        transform: `rotate(${this.rotateDeg}deg)`,
+        transitionDuration: `${this.duration}ms`,
+        marginTop:
+          this.imageRect.width > this.imageRect.height
+            ? `-${(this.imageRect.width - this.imageRect.height) / 2}px`
+            : 0,
+      }
+    },
+  },
+  watch: {
+    async rotateDeg() {
+      await this.$nextTick()
+      this._timer = setInterval(() => {
+        this.updateImageRect()
+      }, 20)
+      setTimeout(() => {
+        clearInterval(this._timer)
+      }, this.duration + 20)
+    },
+  },
+  methods: {
+    handleLoaded() {
+      this.loaded = true
+      this.updateImageRect()
+    },
+    updateImageRect() {
+      const { width, height } = this.$refs.img.getBoundingClientRect()
+      this.imageRect = {
+        width,
+        height,
+      }
+    },
+  },
+}
+</script>
+
+<style lang="scss" scoped>
+@import './RotateWrapper.scss';
+</style>
diff --git a/src/components/Viewer/Viewer.scss b/src/components/Viewer/Viewer.scss
index 0dd905b..2e450ab 100644
--- a/src/components/Viewer/Viewer.scss
+++ b/src/components/Viewer/Viewer.scss
@@ -17,7 +17,7 @@
       &.visible {
         margin-left: 0;
       }
-      .catalog-content {
+      .catalog-container {
         padding-bottom: 20px;
         .catalog-item {
           color: white;
@@ -34,16 +34,22 @@
             height: 14px;
             line-height: 14px;
           }
-          .canvas {
-            width: 110px;
-            // height: 152px;
-            opacity: 0.8;
-            &.active {
-              box-shadow: 0 0 0 4px rgb(84, 201, 255);
-              opacity: 1;
+          &__content {
+
+            * {
+              width: 110px;
+              // height: 152px;
+              opacity: 0.8;
+              transform: var(--item-transform);
             }
-            &:hover {
-              opacity: 1;
+            &.active {
+              img {
+                box-shadow: 0 0 0 4px rgb(84, 201, 255);
+                opacity: 1;
+                &:hover {
+                  opacity: 1;
+                }
+              }
             }
           }
         }
@@ -56,20 +62,25 @@
         .viewer-item {
           padding-bottom: 20px;
           font-size: 0;
-          display: flex;
-          justify-content: center;
-          align-items: center;
+          // display: flex;
+          // justify-content: center;
+          // align-items: center;
           width: 100%;
           page-break-after: always;
-          .canvas {
-            white-space: nowrap;
-            // margin: 0 auto;
-            // display: block;
-            margin: initial;
-            max-width: initial;
-            // margin-bottom: 20px;
-            box-shadow: 0px 0px 7px 6px rgba($color: #000000, $alpha: 0.25);
+          > div {
             transition: transform 300ms ease;
+            flex-shrink: 0;
+            box-shadow: 0px 0px 7px 6px rgba($color: #000000, $alpha: 0.25);
+            margin: 0 auto;
+            .placeholder {
+              width: 100%;
+              white-space: nowrap;
+              // margin: 0 auto;
+              // display: block;
+              margin: initial;
+              max-width: initial;
+              // margin-bottom: 20px;
+            }
           }
         }
       }
@@ -96,9 +107,14 @@
         .viewer-item {
           page-break-after: always!important;
           padding: 0!important;
-          .canvas {
+          > div {
             width: 100% !important;
+            transform: rotate(0)!important;
             box-shadow: none!important;
+            .placeholder {
+              width: 100% !important;
+              box-shadow: none!important;
+            }
           }
         }
       }
diff --git a/src/components/Viewer/Viewer.vue b/src/components/Viewer/Viewer.vue
index ccb65ee..95b9cb8 100644
--- a/src/components/Viewer/Viewer.vue
+++ b/src/components/Viewer/Viewer.vue
@@ -1,5 +1,5 @@
 <template>
-  <IFrame :css="$options.style" ref="iframe">
+  <IFrame :css="$options.viewerStyle" ref="iframe">
     <div class="viewer-container" ref="container">
       <div
         class="scroller catalog"
@@ -8,21 +8,22 @@
           visible: catalogVisible,
         }"
       >
-        <div class="catalog-content" ref="catalogContent">
+        <div class="catalog-container">
           <div
             ref="catalogItem"
             v-for="page in pages"
             class="catalog-item"
             :key="page"
           >
-            <div class="test" :style="thumbnailItemStyle">
-              <canvas
-                ref="catalogCanvas"
-                class="canvas"
+            <div>
+              <div
+                ref="catalogItemContent"
+                class="catalog-item__content"
                 :class="activePage === page && 'active'"
-                :style="thumbnailStyle"
                 @click="handleSwitchPage(page)"
-              />
+              >
+                <RotateWrapper :src="imageList[page - 1]" :rotateDeg="rotate" />
+              </div>
             </div>
             <div class="catalog-index">
               {{ page }}
@@ -38,12 +39,22 @@
       >
         <div class="viewer-content" ref="viewerContent">
           <div
+            ref="viewerItem"
             v-for="page in pages"
             :key="page"
             class="viewer-item"
-            :style="viewerItemStyle"
           >
-            <canvas ref="viewerCanvas" class="canvas" :style="viewerStyle" />
+            <div :style="viewerStyle">
+              <span class="placeholder"></span>
+            </div>
+
+            <!-- TODO: use rotate wrapper -->
+            <!-- <RotateWrapper
+              :src="viewerImageList[page - 1]"
+              :rotateDeg="rotate"
+              :style="viewerStyle"
+              :duration="200"
+            /> -->
           </div>
         </div>
       </div>
@@ -56,13 +67,22 @@ import * as PDF from 'pdfjs-dist/es5/build/pdf.js'
 import PDFWorker from 'pdfjs-dist/es5/build/pdf.worker.js'
 import IFrame from '../IFrame/IFrame.vue'
 import throttle from '../../utils/throttle'
-import style from '!!css-loader!!sass-loader!./Viewer.scss'
+import viewerStyle from '!!css-loader!!sass-loader!./Viewer.scss'
+import getPageBlobList from './getPageBlobList.js'
+import RotateWrapper from '../RotateWrapper/RotateWrapper.vue'
+import rotateWrapperStyle from '!!css-loader!!sass-loader!../RotateWrapper/RotateWrapper.scss'
 
 PDF.GlobalWorkerOptions.workerPort = new PDFWorker()
 
 const MARGIN_OFFSET = 20
 const NORMAL_RATIO = 2
 
+const replacePlaceholder = (container, target) => {
+  const placeholder = container.querySelector('.placeholder')
+
+  placeholder.replaceWith(target)
+}
+
 export default {
   name: 'Viewer',
   props: {
@@ -77,9 +97,11 @@ export default {
       required: true,
     },
   },
-  style: style.toString(),
+  viewerStyle: viewerStyle.toString(),
+  rotateWrapperStyle: rotateWrapperStyle.toString(),
   components: {
     IFrame,
+    RotateWrapper,
   },
   data() {
     return {
@@ -87,6 +109,8 @@ export default {
       viewerContentHeight: 0,
       viewportHeight: 0,
       viewportWidth: 0,
+      imageList: [],
+      viewerImageList: [],
     }
   },
   computed: {
@@ -124,11 +148,6 @@ export default {
           }
         : {}
     },
-    thumbnailStyle() {
-      return {
-        transform: `rotate(${this.rotate}deg)`,
-      }
-    },
   },
   watch: {
     isFullpage(n, o) {
@@ -163,6 +182,7 @@ export default {
     this.render()
   },
   mounted() {
+    this.$refs.iframe.appendStyle(this.$options.rotateWrapperStyle)
     // TODO: element resize replace window resize with Observe
     this.handleResize = throttle(() => {
       this.viewportHeight = this.$refs.container.clientHeight
@@ -260,47 +280,43 @@ export default {
         return
       }
       try {
+        this.$emit('update:isRendering', true)
         await this.$nextTick()
 
-        await Promise.all(
-          this.pages.map(async (pageNum, i) => {
-            const page = await this.pdf.getPage(pageNum)
-            const pageWidth = page.view[2]
-            const containerWidth = this.$el.clientWidth
-            const targetWidth = containerWidth * 0.9
-            const scale = targetWidth / pageWidth
-            // const scale = Math.ceil(this.$el.clientWidth / page.view[2]) + 1
+        const blobs = await getPageBlobList(this.pages, this.pdf)
 
-            const viewport = page.getViewport({
-              scale: scale,
-            })
-            // render viewer
-            const viewerCanvas = this.$refs.viewerCanvas[i]
-            viewerCanvas.width = viewport.width
-            viewerCanvas.height = viewport.height
+        const getImage = blobData => {
+          const image = document.createElement('img')
+          image.className = 'placeholder'
+          image.src = URL.createObjectURL(blobData.blob)
 
-            const renderViewer = page.render({
-              canvasContext: viewerCanvas.getContext('2d'),
-              viewport,
-            }).promise
+          return image
+        }
 
-            // render catalog
-            const catalogScale = 110 / pageWidth
-            const catalogViewport = page.getViewport({
-              scale: catalogScale,
-            })
-            const catalogCanvas = this.$refs.catalogCanvas[i]
-            catalogCanvas.width = catalogViewport.width
-            catalogCanvas.height = catalogViewport.height
+        this.imageList = []
+        const promiseList = blobs.map((blobData, idx) => {
+          const image = getImage(blobData)
+          this.imageList = [...this.imageList, image.src]
+          // const catalogImg = image.cloneNode()
+          // replacePlaceholder(this.$refs.catalogItemContent[idx], catalogImg)
+          const viewerImg = image.cloneNode()
+          this.viewerImageList = [...this.viewerImageList, viewerImg.src]
+          replacePlaceholder(this.$refs.viewerItem[idx], viewerImg)
 
-            const renderCatalog = page.render({
-              canvasContext: catalogCanvas.getContext('2d'),
-              viewport: catalogViewport,
-            })
-            await Promise.all([renderViewer, renderCatalog])
+          // const catalogLoaded = new Promise(resolve => {
+          //   catalogImg.onload = resolve
+          // })
+          const viewerLoaded = new Promise(resolve => {
+            viewerImg.onload = resolve
           })
-        )
+
+          return Promise.all([/*catalogLoaded, */ viewerLoaded])
+        })
+
+        await Promise.all(promiseList)
+
         this.$emit('rendered')
+        this.$emit('update:isRendering', false)
 
         await this.$nextTick()
         this.viewerContentHeight = this.$refs.viewerContent.clientHeight
@@ -315,7 +331,7 @@ export default {
     },
     syncViewerOffset(page) {
       if (this.isScrolling) return
-      this.$refs.viewerCanvas[page - 1].scrollIntoView()
+      this.$refs.viewerItem[page - 1].scrollIntoView()
     },
     syncCatalogOffset(page) {
       const target = this.$refs.catalogItem[page - 1]
diff --git a/src/components/Viewer/getPageBlobList.js b/src/components/Viewer/getPageBlobList.js
new file mode 100644
index 0000000..3d2f1d2
--- /dev/null
+++ b/src/components/Viewer/getPageBlobList.js
@@ -0,0 +1,57 @@
+const getPageBlobList = async (pages, pdf) => {
+  const container = getContainer()
+
+  const promises = pages.map(pageNum => {
+    // eslint-disable-next-line no-async-promise-executor
+    return new Promise(async (resolve, reject) => {
+      try {
+        const page = await pdf.getPage(pageNum)
+
+        renderPage(page, container).then(resolve)
+      } catch (e) {
+        reject(e)
+      }
+    })
+  })
+  const data = await Promise.all(promises)
+
+  container.remove()
+
+  return data
+}
+
+const renderPage = async (page, container) => {
+  // This gives us the page's dimensions at full scale
+  const viewport = page.getViewport({
+    scale: 3,
+  })
+
+  // We'll create a canvas for each page to draw it on
+  const canvas = document.createElement('canvas')
+  canvas.style.display = 'block'
+  container.appendChild(canvas)
+
+  const context = canvas.getContext('2d')
+  canvas.height = viewport.height
+  canvas.width = viewport.width
+
+  // Draw it on the canvas
+  await page.render({ canvasContext: context, viewport }).promise
+
+  return new Promise(resolve =>
+    canvas.toBlob(result =>
+      resolve({ blob: result, height: viewport.height, width: viewport.width })
+    )
+  )
+}
+
+const getContainer = () => {
+  const container = document.createElement('div')
+  container.style.visibility = 'hidden'
+  container.style.display = 'none'
+  document.body.appendChild(container)
+
+  return container
+}
+
+export default getPageBlobList