perf(export): prioritize active tab counts and avoid full-list warmup

electron/services/chatService.ts

@@ -198,6 +198,7 @@ class ChatService {
   private sessionTablesCache = new Map<string, Array<{ tableName: string; dbPath: string }>>()
   private readonly sessionTablesCacheTtl = 300000 // 5分钟
   private sessionMessageCountCache = new Map<string, { count: number; updatedAt: number }>()
+  private sessionMessageCountHintCache = new Map<string, number>()
   private sessionMessageCountCacheScope = ''
   private readonly sessionMessageCountCacheTtlMs = 10 * 60 * 1000
 
@@ -369,6 +370,7 @@ class ChatService {
       if (!connectResult.success) {
         return { success: false, error: connectResult.error }
       }
+      this.refreshSessionMessageCountCacheScope()
 
       const result = await wcdbService.getSessions()
       if (!result.success || !result.sessions) {
@@ -462,6 +464,14 @@ class ChatService {
           lastSenderDisplayName: row.last_sender_display_name,
           selfWxid: myWxid
         })
+
+        if (typeof messageCountHint === 'number') {
+          this.sessionMessageCountHintCache.set(username, messageCountHint)
+          this.sessionMessageCountCache.set(username, {
+            count: messageCountHint,
+            updatedAt: Date.now()
+          })
+        }
       }
 
       // 批量拉取 extra_buffer 状态（isFolded/isMuted），不阻塞主流程
@@ -824,6 +834,16 @@ class ChatService {
         const cached = this.sessionMessageCountCache.get(sessionId)
         if (cached && now - cached.updatedAt <= this.sessionMessageCountCacheTtlMs) {
           counts[sessionId] = cached.count
+          continue
+        }
+
+        const hintCount = this.sessionMessageCountHintCache.get(sessionId)
+        if (typeof hintCount === 'number' && Number.isFinite(hintCount) && hintCount >= 0) {
+          counts[sessionId] = Math.floor(hintCount)
+          this.sessionMessageCountCache.set(sessionId, {
+            count: Math.floor(hintCount),
+            updatedAt: now
+          })
         } else {
           pendingSessionIds.push(sessionId)
         }
@@ -1511,6 +1531,7 @@ class ChatService {
     if (scope === this.sessionMessageCountCacheScope) return
     this.sessionMessageCountCacheScope = scope
     this.sessionMessageCountCache.clear()
+    this.sessionMessageCountHintCache.clear()
   }
 
   private async collectSessionExportStats(

src/pages/ExportPage.tsx

@@ -237,9 +237,8 @@ const timestampOrDash = (timestamp?: number): string => {
 }
 
 const createTaskId = (): string => `task-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`
-const MESSAGE_COUNT_VIEWPORT_PREFETCH = 120
-const MESSAGE_COUNT_BACKGROUND_BATCH = 90
-const MESSAGE_COUNT_BACKGROUND_INTERVAL_MS = 90
+const MESSAGE_COUNT_VIEWPORT_PREFETCH = 180
+const MESSAGE_COUNT_ACTIVE_TAB_WARMUP_LIMIT = 960
 const METRICS_VIEWPORT_PREFETCH = 90
 const METRICS_BACKGROUND_BATCH = 40
 const METRICS_BACKGROUND_INTERVAL_MS = 220
@@ -773,7 +772,7 @@ function ExportPage() {
     }
 
     try {
-      const batchSize = pending.length > 100 ? 48 : 28
+      const batchSize = pending.length > 260 ? 260 : pending.length
       for (let i = 0; i < pending.length; i += batchSize) {
         if (loadTokenAtStart !== sessionLoadTokenRef.current) return
         const chunk = pending.slice(i, i + batchSize)
@@ -872,6 +871,16 @@ function ExportPage() {
     void ensureSessionMessageCounts(targets)
   }, [visibleSessions, ensureSessionMessageCounts])
 
+  useEffect(() => {
+    if (sessions.length === 0) return
+    const activeTabTargets = sessions
+      .filter(session => session.kind === activeTab)
+      .sort((a, b) => (b.sortTimestamp || b.lastTimestamp || 0) - (a.sortTimestamp || a.lastTimestamp || 0))
+      .slice(0, MESSAGE_COUNT_ACTIVE_TAB_WARMUP_LIMIT)
+    if (activeTabTargets.length === 0) return
+    void ensureSessionMessageCounts(activeTabTargets)
+  }, [sessions, activeTab, ensureSessionMessageCounts])
+
   useEffect(() => {
     const targets = visibleSessions.slice(0, METRICS_VIEWPORT_PREFETCH)
     void ensureSessionMetrics(targets)
@@ -889,26 +898,6 @@ function ExportPage() {
     void ensureSessionMetrics(rangeSessions)
   }, [ensureSessionMessageCounts, ensureSessionMetrics])
 
-  useEffect(() => {
-    if (sessions.length === 0) return
-    const prioritySessions = [
-      ...sessions.filter(session => session.kind === activeTab),
-      ...sessions.filter(session => session.kind !== activeTab)
-    ]
-    let cursor = 0
-    const timer = window.setInterval(() => {
-      if (cursor >= prioritySessions.length) {
-        window.clearInterval(timer)
-        return
-      }
-      const chunk = prioritySessions.slice(cursor, cursor + MESSAGE_COUNT_BACKGROUND_BATCH)
-      cursor += MESSAGE_COUNT_BACKGROUND_BATCH
-      void ensureSessionMessageCounts(chunk)
-    }, MESSAGE_COUNT_BACKGROUND_INTERVAL_MS)
-
-    return () => window.clearInterval(timer)
-  }, [sessions, activeTab, ensureSessionMessageCounts])
-
   useEffect(() => {
     if (sessions.length === 0) return
     const prioritySessions = [