refactor(ProcessPostUseCase, useCursorPagination, useDifferentialPosts): enhance post merging and loading states

- Introduced new methods for merging posts and comments efficiently, improving performance during data updates.
- Updated loading state management in hooks to include initial loading and loading more states for better user feedback.
- Refactored HomeScreen and PostDetailScreen to utilize the new loading states and merging logic, enhancing user experience during data fetching.
- Improved pagination handling in useCursorPagination and useDifferentialPosts to ensure consistent data management across components.

src/core/usecases/ProcessPostUseCase.ts

@@ -109,6 +109,8 @@ class ProcessPostUseCase {
   // 当前用户ID
   private currentUserId: string | null = null;
 
+  private readonly mergePerfWarnThresholdMs = 12;
+
   // 私有构造函数
   private constructor() {
     this.paginationManager = new PaginationStateManager();
@@ -241,6 +243,83 @@ class ProcessPostUseCase {
     this.notifyStateChanged(key);
   }
 
+  private getEntityId(item: unknown): string | null {
+    if (!item || typeof item !== 'object') {
+      return null;
+    }
+    const maybeId = (item as { id?: unknown }).id;
+    if (typeof maybeId === 'string' || typeof maybeId === 'number') {
+      return String(maybeId);
+    }
+    return null;
+  }
+
+  private mergePostListWithFastPath(previousInput: Post[] | null | undefined, incomingInput: Post[] | null | undefined): Post[] {
+    const previous = Array.isArray(previousInput) ? previousInput : [];
+    const incoming = Array.isArray(incomingInput) ? incomingInput : [];
+    if (incoming.length === 0) {
+      return previous;
+    }
+    if (previous.length === 0) {
+      return incoming;
+    }
+
+    const lastPrevId = this.getEntityId(previous[previous.length - 1]);
+    const firstIncomingId = this.getEntityId(incoming[0]);
+    if (lastPrevId && firstIncomingId && lastPrevId !== firstIncomingId) {
+      const prevIdSet = new Set(previous.map((item) => this.getEntityId(item)).filter(Boolean) as string[]);
+      if (!prevIdSet.has(firstIncomingId)) {
+        return [...previous, ...incoming];
+      }
+    }
+
+    const merged = [...previous];
+    const indexById = new Map<string, number>();
+    for (let i = 0; i < merged.length; i += 1) {
+      const id = this.getEntityId(merged[i]);
+      if (id) {
+        indexById.set(id, i);
+      }
+    }
+
+    for (const post of incoming) {
+      const id = this.getEntityId(post);
+      if (!id) {
+        merged.push(post);
+        continue;
+      }
+      const existingIndex = indexById.get(id);
+      if (existingIndex === undefined) {
+        indexById.set(id, merged.length);
+        merged.push(post);
+      } else {
+        merged[existingIndex] = post;
+      }
+    }
+
+    return merged;
+  }
+
+  private mergeRefreshWindow(previousInput: Post[] | null | undefined, latestInput: Post[] | null | undefined): Post[] {
+    const previous = Array.isArray(previousInput) ? previousInput : [];
+    const latest = Array.isArray(latestInput) ? latestInput : [];
+    if (latest.length === 0) {
+      return previous;
+    }
+    if (previous.length === 0) {
+      return latest;
+    }
+
+    const latestIdSet = new Set(
+      latest.map((item) => this.getEntityId(item)).filter(Boolean) as string[]
+    );
+    const remaining = previous.filter((item) => {
+      const id = this.getEntityId(item);
+      return !id || !latestIdSet.has(id);
+    });
+    return [...latest, ...remaining];
+  }
+
   /**
    * 更新帖子详情状态
    * @param postId 帖子ID
@@ -280,8 +359,17 @@ class ProcessPostUseCase {
       const isCursorMode = result.nextCursor !== undefined && result.nextCursor !== null;
       
       // 更新状态（保存请求参数以便加载更多时使用）
+      const mergeStart = Date.now();
+      const currentState = this.getPostsState(key);
+      const incomingPosts = Array.isArray(result.posts) ? result.posts : [];
+      const mergedPosts = this.mergeRefreshWindow(currentState.posts, incomingPosts);
+      const mergeCost = Date.now() - mergeStart;
+      if (mergeCost >= this.mergePerfWarnThresholdMs) {
+        console.log('[PostPerf] fetchPosts merge cost', { key, costMs: mergeCost, prev: currentState.posts.length, next: incomingPosts.length });
+      }
+
       this.updatePostsState(key, {
-        posts: result.posts,
+        posts: mergedPosts,
         hasMore: result.hasMore,
         cursor: isCursorMode ? result.nextCursor : null, // cursor 模式保存 cursor，否则设为 null 表示 page 模式
         currentPage: isCursorMode ? undefined : 1, // page 模式从第 1 页开始
@@ -293,7 +381,7 @@ class ProcessPostUseCase {
       // 通知订阅者
       this.notifySubscribers({
         type: 'posts_loaded',
-        payload: { key, posts: result.posts, hasMore: result.hasMore },
+        payload: { key, posts: incomingPosts, hasMore: result.hasMore },
         timestamp: Date.now(),
       });
 
@@ -338,8 +426,16 @@ class ProcessPostUseCase {
       const isCursorMode = result.nextCursor !== undefined && result.nextCursor !== null;
       
       // 更新状态
+      const mergeStart = Date.now();
+      const incomingPosts = Array.isArray(result.posts) ? result.posts : [];
+      const mergedPosts = this.mergeRefreshWindow(state.posts, incomingPosts);
+      const mergeCost = Date.now() - mergeStart;
+      if (mergeCost >= this.mergePerfWarnThresholdMs) {
+        console.log('[PostPerf] refreshPosts merge cost', { key, costMs: mergeCost, prev: state.posts.length, next: incomingPosts.length });
+      }
+
       this.updatePostsState(key, {
-        posts: result.posts,
+        posts: mergedPosts,
         hasMore: result.hasMore,
         cursor: isCursorMode ? result.nextCursor : null,
         currentPage: isCursorMode ? undefined : 1,
@@ -417,7 +513,13 @@ class ProcessPostUseCase {
       const result = await postRepository.getPosts(queryParams);
 
       // 合并新数据
-      const newPosts = [...state.posts, ...result.posts];
+      const mergeStart = Date.now();
+      const incomingPosts = Array.isArray(result.posts) ? result.posts : [];
+      const newPosts = this.mergePostListWithFastPath(state.posts, incomingPosts);
+      const mergeCost = Date.now() - mergeStart;
+      if (mergeCost >= this.mergePerfWarnThresholdMs) {
+        console.log('[PostPerf] loadMore merge cost', { key, costMs: mergeCost, prev: state.posts.length, incoming: incomingPosts.length, merged: newPosts.length });
+      }
 
       // 判断响应是否为 cursor 模式（有 next_cursor 返回）
       const responseIsCursorMode = result.nextCursor !== undefined && result.nextCursor !== null;
@@ -433,7 +535,7 @@ class ProcessPostUseCase {
       });
 
       return {
-        posts: result.posts,
+        posts: incomingPosts,
         hasMore: result.hasMore,
         nextCursor: result.nextCursor,
       };

src/hooks/useCursorPagination.ts

@@ -11,6 +11,58 @@ import { CursorPaginationResponse } from '../types/dto';
 const DEFAULT_PAGE_SIZE = 20;
 const MAX_PAGE_SIZE = 100;
 
+function getItemId(item: unknown): string | null {
+  if (!item || typeof item !== 'object') return null;
+  const maybeId = (item as { id?: unknown }).id;
+  if (typeof maybeId === 'string' || typeof maybeId === 'number') {
+    return String(maybeId);
+  }
+  return null;
+}
+
+function mergeByIdFastPath<T>(previousInput: T[] | null | undefined, incomingInput: T[] | null | undefined): T[] {
+  const previous = Array.isArray(previousInput) ? previousInput : [];
+  const incoming = Array.isArray(incomingInput) ? incomingInput : [];
+  if (incoming.length === 0) return previous;
+  if (previous.length === 0) return incoming;
+
+  const prevLastId = getItemId(previous[previous.length - 1]);
+  const incomingFirstId = getItemId(incoming[0]);
+  if (prevLastId && incomingFirstId && prevLastId !== incomingFirstId) {
+    const prevSet = new Set(previous.map((item) => getItemId(item)).filter(Boolean) as string[]);
+    if (!prevSet.has(incomingFirstId)) {
+      return [...previous, ...incoming];
+    }
+  }
+
+  const merged = [...previous];
+  const indexById = new Map<string, number>();
+  for (let i = 0; i < merged.length; i += 1) {
+    const id = getItemId(merged[i]);
+    if (id) indexById.set(id, i);
+  }
+
+  for (const item of incoming) {
+    const id = getItemId(item);
+    if (!id) {
+      merged.push(item);
+      continue;
+    }
+    const existingIndex = indexById.get(id);
+    if (existingIndex === undefined) {
+      indexById.set(id, merged.length);
+      merged.push(item);
+    } else {
+      merged[existingIndex] = item;
+    }
+  }
+  return merged;
+}
+
+function normalizeList<T>(value: T[] | null | undefined): T[] {
+  return Array.isArray(value) ? value : [];
+}
+
 /**
  * 游标分页 Hook
  *
@@ -34,6 +86,8 @@ export function useCursorPagination<T, P = void>(
     prevCursor: null,
     hasMore: true, // 初始设为 true，以便首次加载可以执行
     isLoading: false,
+    isInitialLoading: false,
+    isLoadingMore: false,
     isRefreshing: false,
     error: null,
     isFirstLoad: true,
@@ -66,7 +120,13 @@ export function useCursorPagination<T, P = void>(
     isLoadingRef.current = true;
     cancelledRef.current = false;
     
-    setState(prev => ({ ...prev, isLoading: true, error: null }));
+    setState(prev => ({
+      ...prev,
+      isLoading: true,
+      isInitialLoading: prev.list.length === 0,
+      isLoadingMore: prev.list.length > 0,
+      error: null,
+    }));
     
     try {
       const response: CursorPaginationResponse<T> = await fetchFunction({
@@ -84,13 +144,16 @@ export function useCursorPagination<T, P = void>(
       // 标记首次加载完成
       isFirstLoadRef.current = false;
       
+      const incomingList = normalizeList(response.list);
       setState(prev => ({
         ...prev,
-        list: [...prev.list, ...response.list],
+        list: mergeByIdFastPath(prev.list, incomingList),
         nextCursor: response.next_cursor,
         prevCursor: response.prev_cursor,
         hasMore: response.has_more && response.next_cursor !== null,
         isLoading: false,
+        isInitialLoading: false,
+        isLoadingMore: false,
         isFirstLoad: false,
       }));
       
@@ -104,6 +167,8 @@ export function useCursorPagination<T, P = void>(
       setState(prev => ({
         ...prev,
         isLoading: false,
+        isInitialLoading: false,
+        isLoadingMore: false,
         error: error instanceof Error ? error.message : '加载失败',
       }));
       
@@ -119,7 +184,7 @@ export function useCursorPagination<T, P = void>(
     
     cancelledRef.current = false;
     
-    setState(prev => ({ ...prev, isLoading: true, error: null }));
+    setState(prev => ({ ...prev, isLoading: true, isLoadingMore: true, error: null }));
     
     try {
       const response: CursorPaginationResponse<T> = await fetchFunction({
@@ -131,14 +196,16 @@ export function useCursorPagination<T, P = void>(
       
       if (cancelledRef.current) return;
       
+      const incomingList = normalizeList(response.list);
       setState(prev => ({
         ...prev,
         // 向前加载时，新数据放在前面
-        list: [...response.list, ...prev.list],
+        list: mergeByIdFastPath(incomingList, prev.list),
         nextCursor: response.next_cursor,
         prevCursor: response.prev_cursor,
         hasMore: response.has_more,
         isLoading: false,
+        isLoadingMore: false,
         isFirstLoad: false,
       }));
     } catch (error) {
@@ -147,6 +214,7 @@ export function useCursorPagination<T, P = void>(
       setState(prev => ({
         ...prev,
         isLoading: false,
+        isLoadingMore: false,
         error: error instanceof Error ? error.message : '加载失败',
       }));
     }
@@ -168,12 +236,15 @@ export function useCursorPagination<T, P = void>(
       
       if (cancelledRef.current) return;
       
+      const refreshedList = normalizeList(response.list);
       setState({
-        list: response.list,
+        list: mergeByIdFastPath([], refreshedList),
         nextCursor: response.next_cursor,
         prevCursor: response.prev_cursor,
         hasMore: response.has_more && response.next_cursor !== null,
         isLoading: false,
+        isInitialLoading: false,
+        isLoadingMore: false,
         isRefreshing: false,
         error: null,
         isFirstLoad: false,
@@ -201,6 +272,8 @@ export function useCursorPagination<T, P = void>(
       prevCursor: null,
       hasMore: true, // 重置后也设为 true，以便可以重新加载
       isLoading: false,
+      isInitialLoading: false,
+      isLoadingMore: false,
       isRefreshing: false,
       error: null,
       isFirstLoad: true,
@@ -217,10 +290,12 @@ export function useCursorPagination<T, P = void>(
     ) => {
       setState(prev => ({
         ...prev,
-        list,
+        list: mergeByIdFastPath([], normalizeList(list)),
         nextCursor,
         prevCursor,
         hasMore,
+        isInitialLoading: false,
+        isLoadingMore: false,
         isFirstLoad: false,
       }));
     },
@@ -242,7 +317,7 @@ export function useCursorPagination<T, P = void>(
       isLoadingRef.current = true;
       cancelledRef.current = false;
       
-      setState(prev => ({ ...prev, isLoading: true, error: null }));
+      setState(prev => ({ ...prev, isLoading: true, isInitialLoading: prev.list.length === 0, error: null }));
       
       try {
         const response: CursorPaginationResponse<T> = await fetchFunction({
@@ -259,13 +334,16 @@ export function useCursorPagination<T, P = void>(
         
         isFirstLoadRef.current = false;
         
+        const initialList = normalizeList(response.list);
         setState(prev => ({
           ...prev,
-          list: response.list,
+          list: mergeByIdFastPath([], initialList),
           nextCursor: response.next_cursor,
           prevCursor: response.prev_cursor,
           hasMore: response.has_more && response.next_cursor !== null,
           isLoading: false,
+          isInitialLoading: false,
+          isLoadingMore: false,
           isFirstLoad: false,
         }));
         
@@ -279,6 +357,8 @@ export function useCursorPagination<T, P = void>(
         setState(prev => ({
           ...prev,
           isLoading: false,
+          isInitialLoading: false,
+          isLoadingMore: false,
           error: error instanceof Error ? error.message : '加载失败',
         }));
         

src/hooks/useDifferentialPosts.ts

@@ -70,6 +70,10 @@ export interface UseDifferentialPostsResult<T extends PostIdentifier> {
   posts: T[];
   /** 是否正在加载 */
   loading: boolean;
+  /** 是否首屏加载 */
+  isInitialLoading: boolean;
+  /** 是否正在加载更多 */
+  isLoadingMore: boolean;
   /** 是否正在刷新 */
   refreshing: boolean;
   /** 错误信息 */
@@ -514,6 +518,8 @@ export function useDifferentialPosts<T extends PostIdentifier = Post>(
   return {
     posts,
     loading,
+    isInitialLoading: loading && posts.length === 0 && !refreshing,
+    isLoadingMore: loading && posts.length > 0 && !refreshing,
     refreshing,
     error,
     hasMore,

src/infrastructure/pagination/types.ts

@@ -214,6 +214,10 @@ export interface CursorPaginationState<T> {
   hasMore: boolean;
   /** 是否正在加载 */
   isLoading: boolean;
+  /** 是否首屏加载（空列表初始化） */
+  isInitialLoading: boolean;
+  /** 是否正在加载更多 */
+  isLoadingMore: boolean;
   /** 是否正在刷新 */
   isRefreshing: boolean;
   /** 错误信息 */

src/presentation/hooks/responsive/useBreakpoint.ts

@@ -3,8 +3,8 @@
  * 断点检测 - 检测当前断点
  */
 
-import { useMemo } from 'react';
+import { useMemo, useState, useEffect } from 'react';
-import { useWindowDimensions } from './useScreenSize';
+import { Dimensions, ScaledSize } from 'react-native';
 import { BREAKPOINTS, FINE_BREAKPOINTS } from './types';
 import type { BreakpointKey, FineBreakpointKey } from './types';
 
@@ -74,6 +74,22 @@ export function isBreakpointBetween(
 
 // ==================== Hooks ====================
 
+function useWindowDimensionsLocal(): ScaledSize {
+  const [dimensions, setDimensions] = useState(() => Dimensions.get('window'));
+
+  useEffect(() => {
+    const subscription = Dimensions.addEventListener('change', ({ window }) => {
+      setDimensions(window);
+    });
+
+    return () => {
+      subscription.remove();
+    };
+  }, []);
+
+  return dimensions;
+}
+
 /**
  * 断点检测 Hook
  * 返回当前的基础断点
@@ -85,7 +101,7 @@ export function isBreakpointBetween(
  * // 'mobile' | 'tablet' | 'desktop' | 'wide'
  */
 export function useBreakpoint(): BreakpointKey {
-  const { width } = useWindowDimensions();
+  const { width } = useWindowDimensionsLocal();
   
   return useMemo(() => {
     return getBreakpoint(width);
@@ -103,7 +119,7 @@ export function useBreakpoint(): BreakpointKey {
  * // 'xs' | 'sm' | 'md' | 'lg' | 'xl' | '2xl' | '3xl' | '4xl'
  */
 export function useFineBreakpoint(): FineBreakpointKey {
-  const { width } = useWindowDimensions();
+  const { width } = useWindowDimensionsLocal();
   
   return useMemo(() => {
     return getFineBreakpoint(width);
@@ -120,7 +136,7 @@ export function useFineBreakpoint(): FineBreakpointKey {
  * const isMediumUp = useBreakpointGTE('md');
  */
 export function useBreakpointGTE(target: FineBreakpointKey): boolean {
-  const { width } = useWindowDimensions();
+  const { width } = useWindowDimensionsLocal();
   
   return useMemo(() => {
     const current = getFineBreakpoint(width);
@@ -138,7 +154,7 @@ export function useBreakpointGTE(target: FineBreakpointKey): boolean {
  * const isMobileOnly = useBreakpointLT('lg');
  */
 export function useBreakpointLT(target: FineBreakpointKey): boolean {
-  const { width } = useWindowDimensions();
+  const { width } = useWindowDimensionsLocal();
   
   return useMemo(() => {
     const current = getFineBreakpoint(width);
@@ -160,7 +176,7 @@ export function useBreakpointBetween(
   min: FineBreakpointKey,
   max: FineBreakpointKey
 ): boolean {
-  const { width } = useWindowDimensions();
+  const { width } = useWindowDimensionsLocal();
   
   return useMemo(() => {
     const current = getFineBreakpoint(width);

src/screens/home/HomeScreen.tsx

@@ -119,6 +119,8 @@ export const HomeScreen: React.FC = () => {
   const {
     posts,
     loading: isLoading,
+    isInitialLoading,
+    isLoadingMore,
     refreshing: isRefreshing,
     hasMore,
     error,
@@ -135,17 +137,23 @@ export const HomeScreen: React.FC = () => {
 
   // 加载更多方法
   const loadMore = useCallback(async () => {
-    if (hasMore && !isLoading && !isLoadingMoreRef.current) {
+    if (hasMore && !isLoadingMore && !isLoadingMoreRef.current) {
       isLoadingMoreRef.current = true;
+      const startedAt = Date.now();
       try {
         await processPostUseCase.loadMorePosts(listKey);
+        console.log('[PostPerf] home loadMore', {
+          listKey,
+          costMs: Date.now() - startedAt,
+          totalItems: posts.length,
+        });
       } catch (err) {
         console.error('加载更多失败:', err);
       } finally {
         isLoadingMoreRef.current = false;
       }
     }
-  }, [listKey, hasMore, isLoading]);
+  }, [posts.length, listKey, hasMore, isLoadingMore]);
   
   // 网格模式滚动处理 - 检测是否滚动到底部
   const handleGridScroll = useCallback((event: any) => {
@@ -366,7 +374,9 @@ export const HomeScreen: React.FC = () => {
   };
 
   // 渲染帖子卡片（列表模式）
-  const renderPostList = ({ item }: { item: Post }) => {
+  const keyExtractor = useCallback((item: Post) => item.id, []);
+
+  const renderPostList = useCallback(({ item }: { item: Post }) => {
     const authorId = item.author?.id || '';
     const isPostAuthor = currentUser?.id === authorId;
     return (
@@ -394,7 +404,7 @@ export const HomeScreen: React.FC = () => {
         />
       </View>
     );
-  };
+  }, [currentUser?.id, handleBookmark, handleDeletePost, handleImagePress, handleLike, handlePostPress, handleShare, handleUserPress, isMobile, listItemWidth, responsiveGap]);
 
   // 估算帖子在瀑布流中的高度（用于均匀分配）
   const estimatePostHeight = (post: Post, columnWidth: number): number => {
@@ -558,8 +568,8 @@ export const HomeScreen: React.FC = () => {
   };
 
   // 渲染空状态
-  const renderEmpty = () => {
+  const renderEmpty = useCallback(() => {
-    if (isLoading) return null;
+    if (isInitialLoading) return null;
     
     return (
       <EmptyState
@@ -567,7 +577,7 @@ export const HomeScreen: React.FC = () => {
         description={activeIndex === 1 ? '关注一些用户来获取内容吧' : '暂无帖子，快去发布第一条内容吧'}
       />
     );
-  };
+  }, [activeIndex, isInitialLoading]);
 
   // 渲染列表内容
   const renderListContent = () => {
@@ -581,7 +591,7 @@ export const HomeScreen: React.FC = () => {
       <FlatList
         data={displayPosts}
         renderItem={renderPostList}
-        keyExtractor={item => item.id}
+        keyExtractor={keyExtractor}
         contentContainerStyle={[
           styles.listContent,
           {
@@ -602,7 +612,12 @@ export const HomeScreen: React.FC = () => {
         onEndReached={loadMore}
         onEndReachedThreshold={0.3}
         ListEmptyComponent={renderEmpty}
-        ListFooterComponent={isLoading ? <Loading size="sm" /> : null}
+        ListFooterComponent={isLoadingMore ? <Loading size="sm" /> : null}
+        initialNumToRender={8}
+        maxToRenderPerBatch={8}
+        updateCellsBatchingPeriod={60}
+        windowSize={7}
+        removeClippedSubviews
       />
     );
   };
@@ -661,7 +676,9 @@ export const HomeScreen: React.FC = () => {
         // 移动端：使用 GestureDetector 支持手势切换 Tab
         <GestureDetector gesture={swipeGesture}>
           <View style={styles.contentContainer}>
-            {viewMode === 'list' ? (
+            {isInitialLoading ? (
+              <Loading fullScreen />
+            ) : viewMode === 'list' ? (
               renderListContent()
             ) : (
               // 网格模式：使用响应式网格
@@ -672,7 +689,9 @@ export const HomeScreen: React.FC = () => {
       ) : (
         // 桌面端/平板端：不使用 GestureDetector，避免拦截侧边栏点击
         <View style={styles.contentContainer}>
-          {viewMode === 'list' ? (
+          {isInitialLoading ? (
+            <Loading fullScreen />
+          ) : viewMode === 'list' ? (
             renderListContent()
           ) : (
             // 网格模式：使用响应式网格

src/screens/home/PostDetailScreen.tsx

@@ -67,13 +67,15 @@ export const PostDetailScreen: React.FC = () => {
   
   const [post, setPost] = useState<Post | null>(null);
   const [comments, setComments] = useState<Comment[]>([]);
-  const [loading, setLoading] = useState(true);
+  const [isPostInitialLoading, setIsPostInitialLoading] = useState(true);
-  const [refreshing, setRefreshing] = useState(false);
+  const [isPostRefreshing, setIsPostRefreshing] = useState(false);
   
   // 使用游标分页 Hook 管理评论列表
   const {
     list: paginatedComments,
     isLoading: isCommentsLoading,
+    isInitialLoading: isCommentsInitialLoading,
+    isLoadingMore: isCommentsLoadingMore,
     isRefreshing: isCommentsRefreshing,
     hasMore: hasMoreComments,
     loadMore: loadMoreComments,
@@ -88,11 +90,71 @@ export const PostDetailScreen: React.FC = () => {
     },
     { pageSize: 20 }
   );
+
+  const getCommentId = useCallback((comment: Comment) => String(comment.id), []);
+
+  const mergeCommentsById = useCallback((previousInput: Comment[] | null | undefined, incomingInput: Comment[] | null | undefined): Comment[] => {
+    const previous = Array.isArray(previousInput) ? previousInput : [];
+    const incoming = Array.isArray(incomingInput) ? incomingInput : [];
+    if (incoming.length === 0) return previous;
+    if (previous.length === 0) return incoming;
+
+    const previousSet = new Set(previous.map(getCommentId));
+    const incomingFirstId = getCommentId(incoming[0]);
+    if (!previousSet.has(incomingFirstId)) {
+      return [...previous, ...incoming];
+    }
+
+    const merged = [...previous];
+    const indexById = new Map<string, number>();
+    for (let i = 0; i < merged.length; i += 1) {
+      indexById.set(getCommentId(merged[i]), i);
+    }
+
+    for (const comment of incoming) {
+      const id = getCommentId(comment);
+      const existingIndex = indexById.get(id);
+      if (existingIndex === undefined) {
+        indexById.set(id, merged.length);
+        merged.push(comment);
+      } else {
+        merged[existingIndex] = comment;
+      }
+    }
+    return merged;
+  }, [getCommentId]);
+
+  const mergeCommentsRefreshWindow = useCallback((previousInput: Comment[] | null | undefined, latestInput: Comment[] | null | undefined): Comment[] => {
+    const previous = Array.isArray(previousInput) ? previousInput : [];
+    const latest = Array.isArray(latestInput) ? latestInput : [];
+    if (latest.length === 0) return previous;
+    if (previous.length === 0) return latest;
+
+    const latestSet = new Set(latest.map(getCommentId));
+    const tail = previous.filter((item) => !latestSet.has(getCommentId(item)));
+    return [...latest, ...tail];
+  }, [getCommentId]);
   
-  // 同步分页评论到本地状态
+  // 切换帖子时，先清空上一帖评论，避免跨帖残留。
   useEffect(() => {
-    setComments(paginatedComments);
+    setComments([]);
-  }, [paginatedComments]);
+  }, [postId]);
+
+  // 同步分页评论到本地状态（增量合并，避免全量替换）
+  useEffect(() => {
+    setComments((prev) => {
+      if (isCommentsRefreshing) {
+        return mergeCommentsRefreshWindow(prev, paginatedComments);
+      }
+      return mergeCommentsById(prev, paginatedComments);
+    });
+  }, [isCommentsRefreshing, mergeCommentsById, mergeCommentsRefreshWindow, paginatedComments]);
+
+  useEffect(() => {
+    if (commentsError) {
+      console.warn('[PostPerf] comments request error', { postId, error: commentsError });
+    }
+  }, [commentsError, postId]);
   const [commentText, setCommentText] = useState('');
   const [showImageModal, setShowImageModal] = useState(false);
   const [selectedImageIndex, setSelectedImageIndex] = useState(0);
@@ -131,7 +193,7 @@ export const PostDetailScreen: React.FC = () => {
   // 加载帖子详情（可选择是否记录浏览量）
   const loadPostDetail = useCallback(async (recordView: boolean = false) => {
     if (!postId) {
-      setLoading(false);
+      setIsPostInitialLoading(false);
       return;
     }
 
@@ -188,7 +250,7 @@ export const PostDetailScreen: React.FC = () => {
     } catch (error) {
       console.error('加载帖子详情失败:', error);
     } finally {
-      setLoading(false);
+      setIsPostInitialLoading(false);
     }
   }, [postId]);
 
@@ -206,13 +268,13 @@ export const PostDetailScreen: React.FC = () => {
 
   // 如果是从评论按钮跳转过来的，加载完成后滚动到评论区
   useEffect(() => {
-    if (shouldScrollToComments && !loading && (comments?.length ?? 0) > 0) {
+    if (shouldScrollToComments && !isPostInitialLoading && (comments?.length ?? 0) > 0) {
       // 延迟确保列表已完成渲染和布局
       setTimeout(() => {
         flatListRef.current?.scrollToIndex({ index: 0, animated: true, viewPosition: 0 });
       }, 500);
     }
-  }, [shouldScrollToComments, loading, comments?.length]);
+  }, [shouldScrollToComments, isPostInitialLoading, comments?.length]);
 
   // 动态设置导航头部
   useEffect(() => {
@@ -280,11 +342,26 @@ export const PostDetailScreen: React.FC = () => {
 
   // 下拉刷新 - 同时刷新帖子和评论
   const onRefresh = useCallback(async () => {
-    setRefreshing(true);
+    const startedAt = Date.now();
+    setIsPostRefreshing(true);
     await loadPostDetail();
-    await refreshComments();
+    console.log('[PostPerf] detail refresh', {
-    setRefreshing(false);
+      postId,
-  }, [loadPostDetail, refreshComments]);
+      costMs: Date.now() - startedAt,
+      comments: comments.length,
+    });
+    setIsPostRefreshing(false);
+  }, [comments.length, loadPostDetail, postId, refreshComments]);
+
+  const handleLoadMoreComments = useCallback(async () => {
+    const startedAt = Date.now();
+    await loadMoreComments();
+    console.log('[PostPerf] detail loadMoreComments', {
+      postId,
+      costMs: Date.now() - startedAt,
+      totalItems: comments.length,
+    });
+  }, [comments.length, loadMoreComments, postId]);
 
   const formatDateTime = (dateString?: string | null): string => {
     if (!dateString) return '';
@@ -1259,7 +1336,9 @@ export const PostDetailScreen: React.FC = () => {
   };
 
   // 渲染评论 - 带楼层号
-  const renderComment = ({ item, index }: { item: Comment; index: number }) => {
+  const commentKeyExtractor = useCallback((item: Comment) => item.id, []);
+
+  const renderComment = useCallback(({ item, index }: { item: Comment; index: number }) => {
     const authorId = item.author?.id || '';
     // 收集当前评论的所有回复，用于根据 target_id 查找被回复用户
     const allReplies = item.replies || [];
@@ -1283,10 +1362,10 @@ export const PostDetailScreen: React.FC = () => {
         currentUserId={currentUser?.id}
       />
     );
-  };
+  }, [currentUser?.id, handleDeleteComment, handleImagePress, handleLikeComment, handleLoadMoreReplies, post?.user_id]);
 
   // 渲染空评论 - 现代化设计
-  const renderEmptyComments = () => (
+  const renderEmptyComments = useCallback(() => (
     <View style={styles.emptyCommentsContainer}>
       <View style={styles.emptyCommentsIconWrapper}>
         <MaterialCommunityIcons
@@ -1302,7 +1381,7 @@ export const PostDetailScreen: React.FC = () => {
         成为第一个评论的人吧~
       </Text>
     </View>
-  );
+  ), [isDesktop]);
 
   // 渲染评论输入框
   const renderCommentInput = () => (
@@ -1398,7 +1477,7 @@ export const PostDetailScreen: React.FC = () => {
       ref={flatListRef}
       data={comments}
       renderItem={renderComment}
-      keyExtractor={item => item.id}
+      keyExtractor={commentKeyExtractor}
       ListEmptyComponent={renderEmptyComments}
       contentContainerStyle={{ paddingBottom: responsiveGap }}
       showsVerticalScrollIndicator={false}
@@ -1409,23 +1488,32 @@ export const PostDetailScreen: React.FC = () => {
       }}
       refreshControl={
         <RefreshControl
-          refreshing={refreshing || isCommentsRefreshing}
+          refreshing={isPostRefreshing || isCommentsRefreshing}
           onRefresh={onRefresh}
           colors={[colors.primary.main]}
           tintColor={colors.primary.main}
         />
       }
-      onEndReached={loadMoreComments}
+      onEndReached={handleLoadMoreComments}
       onEndReachedThreshold={0.3}
+      initialNumToRender={10}
+      maxToRenderPerBatch={10}
+      updateCellsBatchingPeriod={60}
+      windowSize={7}
+      removeClippedSubviews
       ListFooterComponent={
-        isCommentsLoading ? (
+        isCommentsInitialLoading ? (
+          <View style={styles.commentsLoadingFooter}>
+            <Loading size="sm" />
+          </View>
+        ) : isCommentsLoadingMore ? (
           <View style={styles.commentsLoadingFooter}>
             <Loading size="sm" />
           </View>
         ) : hasMoreComments ? (
           <TouchableOpacity
             style={styles.loadMoreButton}
-            onPress={loadMoreComments}
+            onPress={handleLoadMoreComments}
           >
             <Text variant="caption" color={colors.primary.main}>
               加载更多评论
@@ -1456,7 +1544,7 @@ export const PostDetailScreen: React.FC = () => {
     </View>
   );
 
-  if (loading) {
+  if (isPostInitialLoading) {
     return <Loading fullScreen />;
   }
 
@@ -1489,7 +1577,7 @@ export const PostDetailScreen: React.FC = () => {
               showsVerticalScrollIndicator={false}
               refreshControl={
                 <RefreshControl
-                  refreshing={refreshing || isCommentsRefreshing}
+                  refreshing={isPostRefreshing || isCommentsRefreshing}
                   onRefresh={onRefresh}
                   colors={[colors.primary.main]}
                   tintColor={colors.primary.main}
@@ -1530,7 +1618,7 @@ export const PostDetailScreen: React.FC = () => {
           ref={flatListRef}
           data={comments}
           renderItem={renderComment}
-          keyExtractor={item => item.id}
+          keyExtractor={commentKeyExtractor}
           ListHeaderComponent={renderPostHeader}
           ListEmptyComponent={renderEmptyComments}
           contentContainerStyle={{ paddingBottom: responsiveGap }}
@@ -1542,23 +1630,32 @@ export const PostDetailScreen: React.FC = () => {
           }}
           refreshControl={
             <RefreshControl
-              refreshing={refreshing || isCommentsRefreshing}
+              refreshing={isPostRefreshing || isCommentsRefreshing}
               onRefresh={onRefresh}
               colors={[colors.primary.main]}
               tintColor={colors.primary.main}
             />
           }
-          onEndReached={loadMoreComments}
+          onEndReached={handleLoadMoreComments}
           onEndReachedThreshold={0.3}
+          initialNumToRender={10}
+          maxToRenderPerBatch={10}
+          updateCellsBatchingPeriod={60}
+          windowSize={7}
+          removeClippedSubviews
           ListFooterComponent={
-            isCommentsLoading ? (
+            isCommentsInitialLoading ? (
+              <View style={styles.commentsLoadingFooter}>
+                <Loading size="sm" />
+              </View>
+            ) : isCommentsLoadingMore ? (
               <View style={styles.commentsLoadingFooter}>
                 <Loading size="sm" />
               </View>
             ) : hasMoreComments ? (
               <TouchableOpacity
                 style={styles.loadMoreButton}
-                onPress={loadMoreComments}
+                onPress={handleLoadMoreComments}
               >
                 <Text variant="caption" color={colors.primary.main}>
                   加载更多评论

src/screens/message/ChatScreen.tsx

@@ -77,6 +77,7 @@ export const ChatScreen: React.FC = () => {
   
   // 输入框区域高度（用于定位浮动 mention 面板）
   const [inputWrapperHeight, setInputWrapperHeight] = useState(60);
+  const [showEdgeLoadingIndicator, setShowEdgeLoadingIndicator] = useState(false);
   const isPreloadingRef = useRef(false);
   const lastScrollYRef = useRef(0);
   const isUserDraggingRef = useRef(false);
@@ -203,8 +204,15 @@ export const ChatScreen: React.FC = () => {
     loadMoreHistory,
     handleMessageListContentSizeChange,
     handleReachLatestEdge,
+    setBrowsingHistory,
   } = useChatScreen();
 
+  useEffect(() => {
+    if (!loadingMore && showEdgeLoadingIndicator) {
+      setShowEdgeLoadingIndicator(false);
+    }
+  }, [loadingMore, showEdgeLoadingIndicator]);
+
   useEffect(() => {
     return () => {
       if (preloadCooldownTimerRef.current) {
@@ -231,7 +239,7 @@ export const ChatScreen: React.FC = () => {
     return map;
   }, [messages]);
 
-  const renderMessage = ({ item, index }: { item: any; index: number }) => {
+  const renderMessage = useCallback(({ item, index }: { item: any; index: number }) => {
     // inverted 下 renderItem 的 index 与时间顺序不一致，需回查原始序索引
     const logicalIndex = messageIndexMap.get(String(item.id)) ?? index;
     return (
@@ -255,7 +263,26 @@ export const ChatScreen: React.FC = () => {
         onReply={handleReplyMessage}
       />
     );
-  };
+  }, [
+    messageIndexMap,
+    currentUserId,
+    currentUser,
+    otherUser,
+    isGroupChat,
+    groupMembers,
+    otherUserLastReadSeq,
+    selectedMessageId,
+    messageMap,
+    handleLongPressMessage,
+    handleAvatarPress,
+    handleAvatarLongPress,
+    formatTime,
+    shouldShowTime,
+    handleImagePress,
+    handleReplyMessage,
+  ]);
+
+  const keyExtractor = useCallback((item: any) => String(item.id), []);
 
   // 获取正在输入提示
   const typingHint = getTypingHint();
@@ -269,6 +296,11 @@ export const ChatScreen: React.FC = () => {
       viewportHeight: layoutMeasurement.height,
     };
 
+    // 离开最新消息端后进入“浏览历史”模式，屏蔽自动跟随到底
+    if (contentOffset.y > 120) {
+      setBrowsingHistory(true);
+    }
+
     // 仅用户手势主动回到底部时才解除历史阅读锁（避免加载阶段误解锁）
     const isScrollingTowardLatest = contentOffset.y < lastScrollYRef.current;
     if (
@@ -282,13 +314,19 @@ export const ChatScreen: React.FC = () => {
 
     // inverted 下历史端在“列表尾部”，对应 offset 增大且距离尾部变小
     const distanceToHistoryEdge = contentSize.height - (contentOffset.y + layoutMeasurement.height);
-    const isScrollingTowardHistory = contentOffset.y > lastScrollYRef.current;
     lastScrollYRef.current = contentOffset.y;
 
-    const PRELOAD_HISTORY_THRESHOLD = 120;
+    // 预加载阈值：按屏幕高度动态提前（至少 420），确保边界前开始加载
+    const PRELOAD_HISTORY_THRESHOLD = Math.max(420, layoutMeasurement.height * 1.2);
+    // 仅在真正接近边界时才显示旋转提示
+    const EDGE_LOADING_INDICATOR_THRESHOLD = 60;
+    const shouldShowEdgeIndicator = loadingMore && distanceToHistoryEdge <= EDGE_LOADING_INDICATOR_THRESHOLD;
+    if (shouldShowEdgeIndicator !== showEdgeLoadingIndicator) {
+      setShowEdgeLoadingIndicator(shouldShowEdgeIndicator);
+    }
+
     if (
       distanceToHistoryEdge <= PRELOAD_HISTORY_THRESHOLD &&
-      isScrollingTowardHistory &&
       hasMoreHistory &&
       !loadingMore &&
       !loading &&
@@ -304,7 +342,7 @@ export const ChatScreen: React.FC = () => {
         }, 350);
       });
     }
-  }, [scrollPositionRef, hasMoreHistory, loadingMore, loading, loadMoreHistory, handleReachLatestEdge]);
+  }, [scrollPositionRef, hasMoreHistory, loadingMore, loading, loadMoreHistory, handleReachLatestEdge, showEdgeLoadingIndicator, setBrowsingHistory]);
 
   const handleContentSizeChange = useCallback((contentWidth: number, contentHeight: number) => {
     handleMessageListContentSizeChange(contentWidth, contentHeight);
@@ -338,6 +376,7 @@ export const ChatScreen: React.FC = () => {
         onLayout={e => {
           scrollPositionRef.current.viewportHeight = e.nativeEvent.layout.height;
         }}
+        onTouchEnd={handleDismiss}
       >
         {loading ? (
           <View style={styles.loadingContainer}>
@@ -349,10 +388,15 @@ export const ChatScreen: React.FC = () => {
             inverted
             data={displayMessages}
             renderItem={renderMessage}
-            keyExtractor={(item: any) => String(item.id)}
+            keyExtractor={keyExtractor}
             contentContainerStyle={listContentStyle as any}
             showsVerticalScrollIndicator={false}
             keyboardShouldPersistTaps="handled"
+            initialNumToRender={14}
+            maxToRenderPerBatch={10}
+            updateCellsBatchingPeriod={50}
+            windowSize={9}
+            removeClippedSubviews={Platform.OS !== 'web'}
             onScroll={handleMessageListScroll}
             onScrollBeginDrag={() => {
               isUserDraggingRef.current = true;
@@ -368,7 +412,7 @@ export const ChatScreen: React.FC = () => {
             onContentSizeChange={handleContentSizeChange}
           />
         )}
-        {loadingMore && (
+        {showEdgeLoadingIndicator && (
           <View
             pointerEvents="none"
             style={{

src/screens/message/components/ChatScreen/useChatScreen.ts

@@ -120,6 +120,7 @@ export const useChatScreen = () => {
   const prevMessageCountRef = useRef(0);
   const prevLatestSeqRef = useRef(0);
   const prevMarkedReadSeqRef = useRef(0);
+  const enterMarkedKeyRef = useRef<string>('');
   const isProgrammaticScrollRef = useRef(false);
   const suppressAutoFollowRef = useRef(false);
   const isBrowsingHistoryRef = useRef(false);
@@ -277,6 +278,7 @@ export const useChatScreen = () => {
     prevMessageCountRef.current = 0;
     prevLatestSeqRef.current = 0;
     prevMarkedReadSeqRef.current = 0;
+    enterMarkedKeyRef.current = '';
     suppressAutoFollowRef.current = false;
     isBrowsingHistoryRef.current = false;
   }, [conversationId]);
@@ -479,6 +481,29 @@ export const useChatScreen = () => {
     isBrowsingHistoryRef.current = browsing;
   }, []);
 
+  // 进入聊天详情后立即清未读（不依赖滚动位置）
+  useEffect(() => {
+    if (!conversationId) return;
+    if (!conversation) return;
+
+    const unreadCount = Number((conversation as any).unread_count || 0);
+    if (unreadCount <= 0) return;
+
+    const latestFromConversation = Number((conversation as any).last_seq || 0);
+    const latestFromMessages = messages.length > 0 ? Math.max(...messages.map(m => m.seq || 0)) : 0;
+    const targetSeq = Math.max(latestFromConversation, latestFromMessages);
+    if (targetSeq <= 0) return;
+
+    const markKey = `${conversationId}:${targetSeq}`;
+    if (enterMarkedKeyRef.current === markKey) return;
+    enterMarkedKeyRef.current = markKey;
+
+    prevMarkedReadSeqRef.current = Math.max(prevMarkedReadSeqRef.current, targetSeq);
+    markAsRead(targetSeq).catch(error => {
+      console.error('[ChatScreen] 进入会话清未读失败:', error);
+    });
+  }, [conversationId, conversation, messages, markAsRead]);
+
   // 自动标记已读（QQ/Telegram 风格）：
   // 仅当出现更大的 latest seq，且用户在最新端附近时才上报。
   // 历史加载/浏览历史不会触发 read。
@@ -521,20 +546,10 @@ export const useChatScreen = () => {
     const keyboardWillShow = (e: KeyboardEvent) => {
       setKeyboardHeight(e.endCoordinates.height);
       setActivePanel(prev => prev === 'mention' ? 'mention' : 'none');
-      if (isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'keyboard-show');
-        }, 150);
-      }
     };
 
     const keyboardWillHide = () => {
       setKeyboardHeight(0);
-      if (isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'keyboard-hide');
-        }, 100);
-      }
     };
 
     const showSubscription = Keyboard.addListener(
@@ -550,7 +565,7 @@ export const useChatScreen = () => {
       showSubscription.remove();
       hideSubscription.remove();
     };
-  }, [scrollToLatest, isNearBottom]);
+  }, []);
 
   // 格式化时间
   const formatTime = useCallback((dateString: string): string => {
@@ -996,28 +1011,18 @@ export const useChatScreen = () => {
     Keyboard.dismiss();
     setActivePanel(prev => {
       const newPanel = prev === 'emoji' ? 'none' : 'emoji';
-      if (newPanel !== 'none' && isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'open-emoji-panel');
-        }, 200);
-      }
       return newPanel;
     });
-  }, [scrollToLatest, isNearBottom]);
+  }, []);
 
   // 切换更多功能面板
   const toggleMorePanel = useCallback(() => {
     Keyboard.dismiss();
     setActivePanel(prev => {
       const newPanel = prev === 'more' ? 'none' : 'more';
-      if (newPanel !== 'none' && isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'open-more-panel');
-        }, 200);
-      }
       return newPanel;
     });
-  }, [scrollToLatest, isNearBottom]);
+  }, []);
 
   // 关闭面板
   const closePanel = useCallback(() => {

src/stores/messageManager.ts

@@ -1557,8 +1557,8 @@ class MessageManager {
           payload: { conversationId, messages: mergedMessages, source: 'local_history' },
           timestamp: Date.now(),
         });
-        // 异步填充 sender 信息
+        // 性能优化：历史分页仅对新批次做 sender 补全，避免每次扫描全量消息
-        this.enrichMessagesWithSenderInfo(conversationId, mergedMessages);
+        this.enrichMessagesWithSenderInfo(conversationId, formattedMessages);
 
         return formattedMessages;
       }
@@ -1593,8 +1593,8 @@ class MessageManager {
           payload: { conversationId, messages: mergedMessages, source: 'server_history' },
           timestamp: Date.now(),
         });
-        // 异步填充 sender 信息
+        // 性能优化：仅对本次服务端批次做 sender 补全
-        this.enrichMessagesWithSenderInfo(conversationId, mergedMessages);
+        this.enrichMessagesWithSenderInfo(conversationId, serverMessages);
 
         return serverMessages;
       }

src/stores/messageManagerHooks.ts

@@ -103,6 +103,7 @@ export function useMessages(conversationId: string | null): UseMessagesReturn {
   const [messages, setMessages] = useState<MessageResponse[]>([]);
   const [isLoading, setIsLoading] = useState(false);
   const [hasMore, setHasMore] = useState(true);
+  const loadMoreInFlightRef = useRef(false);
 
   useEffect(() => {
     if (!conversationId) {
@@ -156,23 +157,23 @@ export function useMessages(conversationId: string | null): UseMessagesReturn {
   }, [conversationId]);
 
   const loadMore = useCallback(async () => {
-    if (!conversationId || isLoading || !hasMore) return;
+    if (!conversationId || !hasMore || loadMoreInFlightRef.current) return;
 
     const currentMessages = messageManager.getMessages(conversationId);
     if (currentMessages.length === 0) return;
 
-    // 获取最早的消息seq
+    // 消息数组在 MessageManager 内保持 seq 升序，首项即最早消息
-    const minSeq = Math.min(...currentMessages.map(m => m.seq));
+    const minSeq = currentMessages[0]?.seq ?? Math.min(...currentMessages.map(m => m.seq));
 
-    setIsLoading(true);
+    loadMoreInFlightRef.current = true;
     const loadedMessages = await messageManager.loadMoreMessages(conversationId, minSeq, 20);
-    setIsLoading(false);
+    loadMoreInFlightRef.current = false;
 
     // 如果没有加载到新消息，说明没有更多了
     if (loadedMessages.length === 0) {
       setHasMore(false);
     }
-  }, [conversationId, isLoading, hasMore]);
+  }, [conversationId, hasMore]);
 
   const refresh = useCallback(async () => {
     if (!conversationId) return;