diff --git a/.memory/worklog.json b/.memory/worklog.json
index 6d65dd6..ab90b86 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -1,12 +1,5 @@
 {
   "entries": [
-    {
-      "files_changed": 1,
-      "hash": "ddaa795",
-      "message": "docs: record sharp text layout deployment",
-      "ts": "2026-05-20T19:20:47+08:00",
-      "type": "commit"
-    },
     {
       "files_changed": 1,
       "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：docs: record sharp text layout deployment",
@@ -3194,6 +3187,13 @@
       "message": "docs: codify marketing product baseline",
       "hash": "3035efc",
       "files_changed": 3
+    },
+    {
+      "ts": "2026-05-27T15:20:42+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-27 15:20 (~3)",
+      "hash": "fdef7f7",
+      "files_changed": 3
     }
   ]
 }
diff --git a/web/canvas-app/src/stores/canvas.js b/web/canvas-app/src/stores/canvas.js
index 32c28ca..b2ceb72 100644
--- a/web/canvas-app/src/stores/canvas.js
+++ b/web/canvas-app/src/stores/canvas.js
@@ -36,6 +36,32 @@ let isRestoring = false
 // Position change threshold for history | 位置变化阈值
 const POSITION_THRESHOLD = 10
 
+const DEFAULT_NODE_DIMENSIONS = {
+  text: { width: 320, height: 220 },
+  image: { width: 320, height: 260 },
+  imageConfig: { width: 320, height: 280 },
+  video: { width: 320, height: 220 },
+  videoConfig: { width: 320, height: 260 },
+  llmConfig: { width: 360, height: 360 },
+  default: { width: 320, height: 240 }
+}
+
+const normalizeDimensions = (type, dimensions = {}) => {
+  const fallback = DEFAULT_NODE_DIMENSIONS[type] || DEFAULT_NODE_DIMENSIONS.default
+  const width = Number(dimensions.width)
+  const height = Number(dimensions.height)
+
+  return {
+    width: Number.isFinite(width) && width > 0 ? width : fallback.width,
+    height: Number.isFinite(height) && height > 0 ? height : fallback.height
+  }
+}
+
+const normalizeNodeForCanvas = (node) => ({
+  ...node,
+  dimensions: normalizeDimensions(node.type, node.dimensions)
+})
+
 // Batch operation tracking | 批量操作跟踪
 let isBatchOperation = false
 let batchStartState = null
@@ -167,12 +193,14 @@ const checkSignificantChanges = (oldState, newState) => {
 
 const createNode = (type, position, data = {}, rootProps = {}, now = Date.now()) => {
   const id = getNodeId()
+  const { dimensions, ...nodeRootProps } = rootProps
 
   return {
     id,
     type,
     position,
-    ...rootProps,
+    ...nodeRootProps,
+    dimensions: normalizeDimensions(type, dimensions),
     data: {
       ...getDefaultNodeData(type),
       ...data,
@@ -416,7 +444,7 @@ export const loadProject = (projectId) => {
   
   if (canvasData) {
     // Restore nodes | 恢复节点
-    nodes.value = canvasData.nodes || []
+    nodes.value = (canvasData.nodes || []).map(normalizeNodeForCanvas)
     edges.value = canvasData.edges || []
     canvasViewport.value = canvasData.viewport || { x: 100, y: 50, zoom: 0.8 }
     
diff --git a/web/canvas-app/src/views/Canvas.vue b/web/canvas-app/src/views/Canvas.vue
index 48fa230..f960004 100644
--- a/web/canvas-app/src/views/Canvas.vue
+++ b/web/canvas-app/src/views/Canvas.vue
@@ -52,6 +52,7 @@
         :max-zoom="2"
         :snap-to-grid="true"
         :snap-grid="[20, 20]"
+        :only-render-visible-elements="true"
         @connect="onConnect"
         @node-click="onNodeClick"
         @pane-click="onPaneClick"
@@ -61,7 +62,7 @@
       >
         <Background v-if="showGrid" :gap="20" :size="1" />
         <MiniMap
-          v-if="!isMobile"
+          v-if="showMiniMap"
           position="bottom-right"
           :pannable="true"
           :zoomable="true"
@@ -473,6 +474,7 @@ const inputPlaceholder = '你可以试着说"帮我生成一个二次元的卡
 // Quick suggestions | 快捷建议
 const suggestionPage = ref(0)
 const suggestions = computed(() => QUICK_SUGGESTION_GROUPS[suggestionPage.value % QUICK_SUGGESTION_GROUPS.length])
+const showMiniMap = computed(() => !isMobile.value && nodes.value.length <= 120)
 
 const refreshSuggestions = () => {
   suggestionPage.value = (suggestionPage.value + 1) % QUICK_SUGGESTION_GROUPS.length