diff --git a/src/main/group-report-service.ts b/src/main/group-report-service.ts
index 037d085..a7e9548 100644
--- a/src/main/group-report-service.ts
+++ b/src/main/group-report-service.ts
@@ -278,6 +278,7 @@ const renderReportHtml = async (request: GroupReportExportRequest): Promise<stri
 }
 
 const captureFullPage = async (htmlPath: string, pngPath: string): Promise<string> => {
+  console.log(`[GroupReport] capture begin html=${htmlPath}`)
   const reportWindow = new BrowserWindow({
     show: false,
     width: 430,
@@ -289,6 +290,7 @@ const captureFullPage = async (htmlPath: string, pngPath: string): Promise<strin
 
   try {
     await reportWindow.loadFile(htmlPath)
+    console.log('[GroupReport] capture loaded html')
     await reportWindow.webContents.executeJavaScript(`Promise.all([
       document.fonts.ready,
       ...Array.from(document.images).map((img) => img.complete ? Promise.resolve() : new Promise((resolve) => {
@@ -296,29 +298,23 @@ const captureFullPage = async (htmlPath: string, pngPath: string): Promise<strin
         img.addEventListener('error', resolve, { once: true });
       }))
     ])`)
-    reportWindow.webContents.debugger.attach('1.3')
-    const metrics = (await reportWindow.webContents.debugger.sendCommand(
-      'Page.getLayoutMetrics'
-    )) as { cssContentSize: { width: number; height: number } }
-    const width = Math.max(430, Math.ceil(metrics.cssContentSize.width))
-    const height = Math.ceil(metrics.cssContentSize.height)
-    const screenshot = (await reportWindow.webContents.debugger.sendCommand(
-      'Page.captureScreenshot',
-      {
-        format: 'png',
-        captureBeyondViewport: true,
-        fromSurface: true,
-        clip: { x: 0, y: 0, width, height, scale: 1 }
-      }
-    )) as { data: string }
-    const png = Buffer.from(screenshot.data, 'base64')
+    console.log('[GroupReport] capture assets ready')
+    const metrics = (await reportWindow.webContents.executeJavaScript(`({
+      width: Math.ceil(Math.max(document.documentElement.scrollWidth, document.body.scrollWidth, 430)),
+      height: Math.ceil(Math.max(document.documentElement.scrollHeight, document.body.scrollHeight, 800))
+    })`)) as { width: number; height: number }
+    const width = Math.max(430, Math.min(1200, Math.ceil(metrics.width)))
+    const height = Math.max(800, Math.min(20000, Math.ceil(metrics.height)))
+    reportWindow.setContentSize(width, height)
+    await new Promise((resolve) => setTimeout(resolve, 100))
+    console.log(`[GroupReport] capture native page width=${width} height=${height}`)
+    const image = await reportWindow.webContents.capturePage({ x: 0, y: 0, width, height })
+    const png = image.toPNG()
     if (png.length < 1000) throw new Error('生成的日报图片为空')
     await fs.writeFile(pngPath, png)
-    return `data:image/png;base64,${screenshot.data}`
+    console.log(`[GroupReport] capture ok bytes=${png.length} png=${pngPath}`)
+    return `data:image/png;base64,${png.toString('base64')}`
   } finally {
-    if (reportWindow.webContents.debugger.isAttached()) {
-      reportWindow.webContents.debugger.detach()
-    }
     reportWindow.destroy()
   }
 }
diff --git a/src/preload/index.d.ts b/src/preload/index.d.ts
index dcfbcc6..bdc10ec 100644
--- a/src/preload/index.d.ts
+++ b/src/preload/index.d.ts
@@ -38,6 +38,7 @@ declare global {
         key: string
       ) => Promise<boolean | { success: boolean; error?: string; monitoring?: boolean }>
       getContacts: (filter?: string) => Promise<Contact[]>
+      getContactAvatars: (usernames: string[]) => Promise<Record<string, string>>
       getMessages: (userMd5: string, startTime?: number, endTime?: number) => Promise<Message[]>
       getGroupSnapshot: (userMd5: string) => Promise<{
         roomId: string
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 65c74dd..b5cc046 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -6,6 +6,7 @@ import { GroupReportExportRequest } from '../shared/group-report'
 const api = {
   initDb: (key: string) => ipcRenderer.invoke('db:init', key),
   getContacts: (filter?: string) => ipcRenderer.invoke('db:getContacts', filter),
+  getContactAvatars: (usernames: string[]) => ipcRenderer.invoke('db:getContactAvatars', usernames),
   getMessages: (userMd5: string, startTime?: number, endTime?: number) =>
     ipcRenderer.invoke('db:getMessages', userMd5, startTime, endTime),
   getGroupSnapshot: (userMd5: string) => ipcRenderer.invoke('db:getGroupSnapshot', userMd5),
diff --git a/src/renderer/src/App.tsx b/src/renderer/src/App.tsx
index 7ae9f40..935baaf 100644
--- a/src/renderer/src/App.tsx
+++ b/src/renderer/src/App.tsx
@@ -12,7 +12,7 @@ interface SelfInfo {
 }
 
 const MAC_KEY_FAQ_URL = 'https://github.com/hicccc77/WeFlow/blob/main/docs/MAC-KEY-FAQ.md'
-const MESSAGE_MONITOR_DEBOUNCE_MS = 250
+const MESSAGE_MONITOR_DEBOUNCE_MS = 8000
 
 const getMessageIdentity = (message: Message): string => {
   if (message.localId) return `local:${message.localId}`
@@ -35,6 +35,8 @@ type GroupSnapshot = {
   members: { wxid: string; nickname: string; avatar: string }[]
 }
 
+type GroupMemberMeta = { nickname: string; avatar: string }
+
 const formatGroupMemberName = (member: GroupSnapshot['members'][number]): string =>
   member.nickname || member.wxid
 
@@ -83,6 +85,8 @@ const buildSyntheticGroupMessages = (
   return events
 }
 
+void buildSyntheticGroupMessages
+
 const sortMessagesChronologically = (items: Message[]): Message[] =>
   [...items].sort((left, right) => {
     const timeDelta = (left.createTime || 0) - (right.createTime || 0)
@@ -111,6 +115,8 @@ function App(): React.ReactElement {
   const [autoConnectSource, setAutoConnectSource] = useState<'env' | 'saved' | null>(null)
   const currentGroupSnapshotRef = React.useRef<GroupSnapshot | null>(null)
   const syntheticGroupMessagesRef = React.useRef<Record<string, Message[]>>({})
+  const groupMemberMetaRef = React.useRef<Record<string, Map<string, GroupMemberMeta>>>({})
+  const selectedContactMd5Ref = React.useRef<string>('')
 
   const refreshSelfInfo = async (): Promise<void> => {
     try {
@@ -130,6 +136,34 @@ function App(): React.ReactElement {
     const list = await window.api.getContacts()
     setContacts(list)
     setFilteredContacts(list)
+    void hydrateContactAvatars(list)
+  }
+
+  const hydrateContactAvatars = async (list: Contact[]): Promise<void> => {
+    const usernames = Array.from(
+      new Set(
+        list
+          .map((contact) => contact.m_nsUsrName)
+          .filter((username) => username && !username.startsWith('Group_') && !username.startsWith('Unknown_'))
+      )
+    )
+    const chunkSize = 60
+    for (let index = 0; index < usernames.length; index += chunkSize) {
+      const chunk = usernames.slice(index, index + chunkSize)
+      if (chunk.length === 0) continue
+      try {
+        const avatars = await window.api.getContactAvatars(chunk)
+        setContacts((current) =>
+          current.map((contact) => avatars[contact.m_nsUsrName] ? { ...contact, avatar: avatars[contact.m_nsUsrName] } : contact)
+        )
+        setFilteredContacts((current) =>
+          current.map((contact) => avatars[contact.m_nsUsrName] ? { ...contact, avatar: avatars[contact.m_nsUsrName] } : contact)
+        )
+      } catch (error) {
+        console.warn('[Contacts] avatar hydrate failed:', error)
+      }
+      await new Promise((resolve) => window.setTimeout(resolve, 50))
+    }
   }
 
   React.useEffect(() => {
@@ -148,6 +182,16 @@ function App(): React.ReactElement {
         if (active) setBootState('login')
         return
       }
+      if (active) {
+        setDbKey(key)
+        setAutoConnectSource(envKey ? 'env' : 'saved')
+        setDbKeyStatus(
+          envKey ? '已加载环境变量中的密钥，请手动点击 Connect' : '已加载安全保存的密钥，请手动点击 Connect'
+        )
+        setDbKeyStatusKind('normal')
+        setBootState('login')
+      }
+      if (true) return
       if (active) {
         setBootState('connecting')
         setDbKey(key)
@@ -158,7 +202,7 @@ function App(): React.ReactElement {
         setDbKeyStatusKind('normal')
       }
       try {
-        const result = await window.api.initDb(key)
+        const result: any = await window.api.initDb(key)
         if (!active) return
         const success = typeof result === 'boolean' ? result : result.success
         if (success) {
@@ -176,7 +220,7 @@ function App(): React.ReactElement {
           setDbKeyStatusKind('error')
           setBootState('login')
         }
-      } catch (error) {
+      } catch (error: any) {
         if (!active) return
         const message = error instanceof Error ? error.message : String(error)
         setDbKeyStatus(`自动连接失败: ${message}`)
@@ -255,6 +299,45 @@ function App(): React.ReactElement {
     []
   )
 
+  const applyGroupMemberMeta = React.useCallback(
+    (contact: Contact | null, baseMessages: Message[]): Message[] => {
+      if (!contact || contact.type !== 'group') return baseMessages
+      const memberMap = groupMemberMetaRef.current[contact.md5]
+      if (!memberMap || memberMap.size === 0) return baseMessages
+
+      return baseMessages.map((message) => {
+        const senderId = String(message.senderId || message.name || '').trim()
+        if (!senderId || !senderId.startsWith('wxid_')) return message
+        const member = memberMap.get(senderId)
+        if (!member) return message
+        const nickname = member.nickname && !member.nickname.startsWith('wxid_') ? member.nickname : senderId
+        return {
+          ...message,
+          name: nickname,
+          img: message.img || member.avatar
+        }
+      })
+    },
+    []
+  )
+
+  const loadGroupMemberMeta = React.useCallback(
+    async (contact: Contact | null): Promise<GroupSnapshot | null> => {
+      if (!contact || contact.type !== 'group') return null
+      const snapshot = await logGroupSnapshot(contact, 'load-member-meta')
+      if (!snapshot) return null
+      currentGroupSnapshotRef.current = snapshot
+      groupMemberMetaRef.current[contact.md5] = new Map(
+        snapshot.members.map((member) => [
+          member.wxid,
+          { nickname: member.nickname || member.wxid, avatar: member.avatar || '' }
+        ])
+      )
+      return snapshot
+    },
+    [logGroupSnapshot]
+  )
+
   const handleAutoGetDbKey = async (): Promise<void> => {
     if (isFetchingDbKey) return
     setIsFetchingDbKey(true)
@@ -338,11 +421,22 @@ function App(): React.ReactElement {
 
   const handleSelectContact = async (contact: Contact): Promise<void> => {
     setSelectedContact(contact)
+    selectedContactMd5Ref.current = contact.md5
+    currentGroupSnapshotRef.current = null
     const { startTime, endTime } = getDateRangeParams(dateRange)
     const msgs = await window.api.getMessages(contact.md5, startTime, endTime)
-    const snapshot = await logGroupSnapshot(contact, 'select-contact')
-    currentGroupSnapshotRef.current = snapshot
-    setMessages(mergeSyntheticMessages(contact, msgs, snapshot?.roomId))
+    if (selectedContactMd5Ref.current !== contact.md5) return
+    const cachedMessages = applyGroupMemberMeta(contact, mergeSyntheticMessages(contact, msgs))
+    setMessages(cachedMessages)
+    if (contact.type === 'group') {
+      void loadGroupMemberMeta(contact).then((snapshot) => {
+        if (selectedContactMd5Ref.current !== contact.md5) return
+        if (!snapshot) return
+        setMessages((current) =>
+          applyGroupMemberMeta(contact, mergeSyntheticMessages(contact, current, snapshot.roomId))
+        )
+      })
+    }
   }
 
   const handleDateRangeChange = (range: string): void => {
@@ -350,7 +444,7 @@ function App(): React.ReactElement {
     if (selectedContact) {
       const { startTime, endTime } = getDateRangeParams(range)
       window.api.getMessages(selectedContact.md5, startTime, endTime).then((nextMessages) => {
-        setMessages(mergeSyntheticMessages(selectedContact, nextMessages))
+        setMessages(applyGroupMemberMeta(selectedContact, mergeSyntheticMessages(selectedContact, nextMessages)))
       })
     }
   }
@@ -360,9 +454,16 @@ function App(): React.ReactElement {
 
     let disposed = false
     let refreshTimer: number | null = null
+    let refreshInFlight = false
+    let refreshQueued = false
     const contactMd5 = selectedContact.md5
 
     const refreshCurrentConversation = async (): Promise<void> => {
+      if (refreshInFlight) {
+        refreshQueued = true
+        return
+      }
+      refreshInFlight = true
       try {
         const range = getDateRangeParams(dateRange)
         const latestMessages = await window.api.getMessages(
@@ -370,41 +471,9 @@ function App(): React.ReactElement {
           range.startTime,
           range.endTime
         )
-        const latestSnapshot = await logGroupSnapshot(selectedContact, 'wcdb-change')
-        const syntheticEvents = buildSyntheticGroupMessages(
-          currentGroupSnapshotRef.current,
-          latestSnapshot,
-          latestMessages
-        )
-        if (latestSnapshot) {
-          currentGroupSnapshotRef.current = latestSnapshot
-          if (syntheticEvents.length) {
-            const existing = syntheticGroupMessagesRef.current[latestSnapshot.roomId] || []
-            const existingIds = new Set(existing.map((message) => message.id))
-            const appended = syntheticEvents.filter((message) => !existingIds.has(message.id))
-            if (appended.length) {
-              syntheticGroupMessagesRef.current[latestSnapshot.roomId] = [...existing, ...appended]
-              console.log(
-                `[GroupMonitor] merged synthetic messages roomId=${latestSnapshot.roomId} total=${syntheticGroupMessagesRef.current[latestSnapshot.roomId].length}`
-              )
-              if (!disposed) {
-                setMessages((current) =>
-                  sortMessagesChronologically([
-                    ...current,
-                    ...appended.filter(
-                      (message) =>
-                        !current.some((existingMessage) => existingMessage.id === message.id)
-                    )
-                  ])
-                )
-              }
-            }
-          }
-        }
-        const nextMessages = mergeSyntheticMessages(
+        const nextMessages = applyGroupMemberMeta(
           selectedContact,
-          latestMessages,
-          latestSnapshot?.roomId
+          mergeSyntheticMessages(selectedContact, latestMessages)
         )
         if (!disposed) {
           setMessages((current) =>
@@ -414,6 +483,15 @@ function App(): React.ReactElement {
       } catch (error) {
         console.warn('[MessageMonitor] 刷新当前会话失败:', error)
       }
+      refreshInFlight = false
+      if (refreshQueued && !disposed) {
+        refreshQueued = false
+        if (refreshTimer) window.clearTimeout(refreshTimer)
+        refreshTimer = window.setTimeout(() => {
+          refreshTimer = null
+          void refreshCurrentConversation()
+        }, MESSAGE_MONITOR_DEBOUNCE_MS)
+      }
     }
 
     const unsubscribe = window.api.onWcdbChange(() => {
@@ -435,6 +513,7 @@ function App(): React.ReactElement {
     isNativeMonitorActive,
     selectedContact,
     logGroupSnapshot,
+    applyGroupMemberMeta,
     mergeSyntheticMessages
   ])
 
diff --git a/src/renderer/src/components/ChatWindow.tsx b/src/renderer/src/components/ChatWindow.tsx
index 7b76cd4..7c928a1 100644
--- a/src/renderer/src/components/ChatWindow.tsx
+++ b/src/renderer/src/components/ChatWindow.tsx
@@ -25,6 +25,25 @@ const SUMMARY_DATE_OPTIONS: { value: SummaryDateRange; label: string }[] = [
   { value: 'yesterday', label: '昨日' },
   { value: '7days', label: '最近 7 天' }
 ]
+const MAX_RENDERED_MESSAGES = 600
+const REPORT_STEP_TIMEOUT_MS = 90_000
+
+const withTimeout = async <T,>(promise: Promise<T>, label: string): Promise<T> => {
+  let timer: number | undefined
+  const timeout = new Promise<never>((_, reject) => {
+    timer = window.setTimeout(() => reject(new Error(`${label} 超时`)), REPORT_STEP_TIMEOUT_MS)
+  })
+  try {
+    return await Promise.race([promise, timeout])
+  } finally {
+    if (timer) window.clearTimeout(timer)
+  }
+}
+
+const isInternalName = (value?: string): boolean => {
+  const text = String(value || '').trim()
+  return !text || /^wxid_/i.test(text) || /@chatroom$/i.test(text) || /^[a-z0-9_-]{18,}$/i.test(text)
+}
 
 const SUMMARY_TYPE_OPTIONS: {
   value: SummaryMessageType
@@ -240,20 +259,47 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
       const reportMessages = rangeMessages.filter((message) => allowedTypes.has(message.type))
       if (!reportMessages.length) throw new Error('当前条件下没有可总结的消息')
 
-      const input = buildGroupReportInput(reportMessages, contact, isGroupChat)
+      let memberMap = new Map<string, { nickname: string; avatar: string }>()
+      if (isGroupChat) {
+        try {
+          const snapshot = await withTimeout(window.api.getGroupSnapshot(contact.md5), '读取群成员')
+          memberMap = new Map(
+            (snapshot?.members || []).map((member) => [
+              member.wxid,
+              { nickname: member.nickname || member.wxid, avatar: member.avatar || '' }
+            ])
+          )
+        } catch (error) {
+          console.warn('[GroupReport] member snapshot failed:', error)
+        }
+      }
+      const namedReportMessages = reportMessages.map((message) => {
+        if (!isGroupChat || !isInternalName(message.name)) return message
+        const senderId = String(message.senderId || message.name || '')
+        const member = memberMap.get(senderId)
+        if (!member?.nickname || isInternalName(member.nickname)) return message
+        return { ...message, name: member.nickname, img: message.img || member.avatar }
+      })
+      const input = buildGroupReportInput(namedReportMessages, contact, isGroupChat)
       console.log('🚀 ~ AIChat ~ input:', input)
       console.log('🚀 ~ AIChat ~ input.prompt:', input.prompt)
-      const result = await window.api.aiChat(
-        [
-          { role: 'system', content: GROUP_REPORT_SYSTEM_PROMPT },
-          { role: 'user', content: input.prompt }
-        ],
-        { apiKey, model, baseURL }
+      const result = await withTimeout(
+        window.api.aiChat(
+          [
+            { role: 'system', content: GROUP_REPORT_SYSTEM_PROMPT },
+            { role: 'user', content: input.prompt }
+          ],
+          { apiKey, model, baseURL }
+        ),
+        'AI 生成日报'
       )
 
       if (!result.success || !result.data) throw new Error(result.error || 'AI 请求失败')
       const report = parseGroupDailyReport(result.data, input.topSpeakers, input.activeTimeline)
-      const exported = await window.api.exportGroupReport({ report, metadata: input.metadata })
+      const exported = await withTimeout(
+        window.api.exportGroupReport({ report, metadata: input.metadata }),
+        '日报图片导出'
+      )
       if (!exported.success || !exported.imageDataUrl || !exported.htmlPath || !exported.pngPath) {
         throw new Error(exported.error || '日报文件生成失败')
       }
@@ -285,6 +331,11 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
       return typeMatch && contentMatch
     })
   }, [messages, contentFilter])
+  const hiddenMessageCount = Math.max(0, filteredMessages.length - MAX_RENDERED_MESSAGES)
+  const renderedMessages = React.useMemo(
+    () => filteredMessages.slice(-MAX_RENDERED_MESSAGES),
+    [filteredMessages]
+  )
 
   if (!contact) {
     return (
@@ -302,7 +353,14 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
       </div>
 
       <div className="message-list wechat-message-list">
-        {filteredMessages.map((msg) => {
+        {hiddenMessageCount > 0 && (
+          <div className="wechat-system-message-row">
+            <div className="wechat-system-message">
+              已隐藏较早的 {hiddenMessageCount} 条消息，当前显示最新 {MAX_RENDERED_MESSAGES} 条
+            </div>
+          </div>
+        )}
+        {renderedMessages.map((msg) => {
           const isMine = msg.from === 'assistant'
           const isSystem = msg.from === 'system' || msg.type === '系统消息'
           const displayName = isMine
diff --git a/src/shared/types.ts b/src/shared/types.ts
index 18f8016..2bf8c61 100644
--- a/src/shared/types.ts
+++ b/src/shared/types.ts
@@ -15,6 +15,7 @@ export interface Message {
   isSender: boolean
   img?: string
   name?: string
+  senderId?: string
   contentData?: ParsedContent
   voiceDataUrl?: string
   voiceDuration?: number