diff --git a/src/views/im/home/pages/conversation/components/conversation/ConversationPrivateSide.vue b/src/views/im/home/pages/conversation/components/conversation/ConversationPrivateSide.vue
index a02c41b18..604e07e9b 100644
--- a/src/views/im/home/pages/conversation/components/conversation/ConversationPrivateSide.vue
+++ b/src/views/im/home/pages/conversation/components/conversation/ConversationPrivateSide.vue
@@ -13,7 +13,15 @@
     append-to-body
     modal-class="im-conversation-private-side__modal"
   >
-    <div v-if="friend" class="flex flex-col h-full bg-[var(--el-bg-color)]">
+    <!-- friend 缺失场景：陌生人会话刚打开 / 好友数据还没补拉到；空白会让用户以为抽屉坏了，给个加载占位 -->
+    <div
+      v-if="!friend"
+      v-loading="true"
+      class="flex flex-col items-center justify-center h-full text-13px text-[var(--el-text-color-placeholder)] bg-[var(--el-bg-color)]"
+    >
+      加载中…
+    </div>
+    <div v-else class="flex flex-col h-full bg-[var(--el-bg-color)]">
       <div class="flex-1 overflow-y-auto bg-[var(--el-fill-color-light)]">
         <!-- 好友宫格：原 tile + "+" tile，对齐 GroupSide 视觉，让两种抽屉看起来是一家的 -->
         <div class="flex flex-wrap gap-1 px-4 pt-4 pb-[14px] bg-[var(--el-bg-color)]">
@@ -194,7 +202,7 @@ watch(visible, (open) => {
   }
 })
 
-/** 备注 popover 点击保存：先走 store API 同步后端，成功后再关 popover + 提示 */
+/** 备注 popover 点击保存：先走 store API 同步后端，成功后再关 popover + 提示（接口错误由全局拦截器统一 toast，不重复 catch） */
 async function handleSaveDisplayName() {
   if (!props.friend) {
     return
diff --git a/src/views/im/home/store/faceStore.ts b/src/views/im/home/store/faceStore.ts
index 3aa7fede8..3fe789492 100644
--- a/src/views/im/home/store/faceStore.ts
+++ b/src/views/im/home/store/faceStore.ts
@@ -28,6 +28,9 @@ export const useFaceStore = defineStore('imFace', () => {
   /** 个人表情包列表（用户长按「添加到表情」/ 上传产生） */
   const faceUserItems = ref<ImFaceUserItemVO[]>([])
 
+  /** reset() 时递增；旧账号那次还没返回的请求 resolve 后比对一致才写 store，防跨账号数据泄漏 */
+  let storeEpoch = 0
+
   /**
    * 系统表情包拉取 promise；ensureFacePacks 内 cache：
    * - null = 还没拉过，下次调用真发请求
@@ -38,13 +41,19 @@ export const useFaceStore = defineStore('imFace', () => {
   /** 按需拉取系统表情包（已拉过则直接复用 cached promise） */
   async function ensureFacePacks(): Promise<void> {
     if (!facePacksPromise) {
+      const requestEpoch = storeEpoch
       facePacksPromise = apiGetFacePackList()
         .then((data) => {
+          if (requestEpoch !== storeEpoch) {
+            return
+          }
           facePacks.value = data || []
         })
         .catch((e) => {
           console.warn('[IM] 拉取表情包失败', e)
-          facePacksPromise = null
+          if (requestEpoch === storeEpoch) {
+            facePacksPromise = null
+          }
           throw e
         })
     }
@@ -56,13 +65,19 @@ export const useFaceStore = defineStore('imFace', () => {
   /** 按需拉取个人表情（已拉过则直接复用 cached promise） */
   async function ensureFaceUserItems(): Promise<void> {
     if (!faceUserItemsPromise) {
+      const requestEpoch = storeEpoch
       faceUserItemsPromise = apiGetFaceUserItemList()
         .then((data) => {
+          if (requestEpoch !== storeEpoch) {
+            return
+          }
           faceUserItems.value = data || []
         })
         .catch((e) => {
           console.warn('[IM] 拉取个人表情失败', e)
-          faceUserItemsPromise = null
+          if (requestEpoch === storeEpoch) {
+            faceUserItemsPromise = null
+          }
           throw e
         })
     }
@@ -76,11 +91,16 @@ export const useFaceStore = defineStore('imFace', () => {
    * 返回 true / false 与 removeFaceUserItem 风格对齐；调用方按 boolean 决定是否提示
    */
   async function addFaceUserItem(reqVO: ImFaceUserItemSaveReqVO): Promise<boolean> {
+    const requestEpoch = storeEpoch
     try {
       const id = await apiCreateFaceUserItem(reqVO)
       if (!id) {
         return false
       }
+      // reset 已切账号：旧请求拿到的 id 不能再 unshift 进新账号内存
+      if (requestEpoch !== storeEpoch) {
+        return false
+      }
       // id 不在缓存里才插入；服务端唯一约束兜底了 race，本地理论上不会拿到重复 id
       if (!faceUserItems.value.some((item) => item.id === id)) {
         faceUserItems.value.unshift({
@@ -100,8 +120,13 @@ export const useFaceStore = defineStore('imFace', () => {
 
   /** 删除个人表情；本地立即移除 */
   async function removeFaceUserItem(id: number): Promise<boolean> {
+    const requestEpoch = storeEpoch
     try {
       await apiDeleteFaceUserItem(id)
+      // reset 已切账号：不要再 filter 新账号列表
+      if (requestEpoch !== storeEpoch) {
+        return false
+      }
       faceUserItems.value = faceUserItems.value.filter((item) => item.id !== id)
       return true
     } catch (e) {
@@ -116,6 +141,7 @@ export const useFaceStore = defineStore('imFace', () => {
     faceUserItems.value = []
     facePacksPromise = null
     faceUserItemsPromise = null
+    storeEpoch++
   }
 
   return {
diff --git a/src/views/im/home/store/friendStore.ts b/src/views/im/home/store/friendStore.ts
index 85afc5bbd..be2a2f6ad 100644
--- a/src/views/im/home/store/friendStore.ts
+++ b/src/views/im/home/store/friendStore.ts
@@ -77,12 +77,23 @@ export const useFriendStore = defineStore('imFriendStore', {
   }),
 
   getters: {
+    /**
+     * friendUserId → Friend 的 O(1) 索引；从 friends 数组派生，Pinia 在 friends 变化时自动重算
+     *
+     * 消息渲染需要按 senderId 反查发送人头像 / 备注，每条消息渲染都会 getFriend；
+     * 直接 find 时 N 条消息 × M 好友 = O(N×M)；建索引后单次读 O(1)，重建只在写好友（fetchFriends / upsertFriend 等）时发生
+     */
+    friendMap: (state): Map<number, Friend> => {
+      const map = new Map<number, Friend>()
+      for (const friend of state.friends) {
+        map.set(friend.friendUserId, friend)
+      }
+      return map
+    },
     /** 按 friendUserId 找好友（含已软删的 DISABLE 记录，调用方自行判定） */
-    getFriend:
-      (state) =>
-      (friendUserId: number): Friend | undefined => {
-        return state.friends.find((friend) => friend.friendUserId === friendUserId)
-      },
+    getFriend(): (friendUserId: number) => Friend | undefined {
+      return (friendUserId: number) => this.friendMap.get(friendUserId)
+    },
     /** 当前生效的好友列表（过滤掉 DISABLE 软删记录） */
     getActiveFriends: (state): Friend[] => {
       return state.friends.filter((friend) => friend.status !== CommonStatusEnum.DISABLE)
@@ -195,11 +206,16 @@ export const useFriendStore = defineStore('imFriendStore', {
 
     /** 按 friendUserId 获取详情并合并到本地（保证 nickname / avatar 最新） */
     async loadFriendInfo(friendUserId: number) {
+      const requestEpoch = storeEpoch
       try {
         const data = await apiGetFriend(friendUserId)
         if (!data) {
           return
         }
+        // clear() 已切账号：旧请求的好友详情不能再 upsert 进新账号的 friends
+        if (requestEpoch !== storeEpoch) {
+          return
+        }
         this.upsertFriend(convertFriend(data))
       } catch (e) {
         console.warn('[IM friendStore] loadFriendInfo 失败', e)
@@ -301,10 +317,15 @@ export const useFriendStore = defineStore('imFriendStore', {
 
     /** 按 id 从后端单查并 upsert 到本地（dispatcher 兜底用，避免全量重拉）；后端带越权过滤 */
     async loadFriendRequest(requestId: number) {
+      const requestEpoch = storeEpoch
       const data = await apiGetMyFriendRequest(requestId)
       if (!data) {
         return
       }
+      // clear() 已切账号：旧请求的申请记录不能再写进新账号的 friendRequests
+      if (requestEpoch !== storeEpoch) {
+        return
+      }
       const next = convertFriendRequest(data)
       const existing = this.findFriendRequest(requestId)
       if (existing) {
@@ -329,13 +350,21 @@ export const useFriendStore = defineStore('imFriendStore', {
 
     /** 删除好友（单向软删，本端置 DISABLE）；clear=true 时级联清理本地相关数据（如私聊会话），并透传后端给多端同步 */
     async deleteFriend(friendUserId: number, clear: boolean = true) {
+      const requestEpoch = storeEpoch
       await apiDeleteFriend(friendUserId, clear)
+      if (requestEpoch !== storeEpoch) {
+        return
+      }
       this.removeFriend(friendUserId, clear)
     },
 
     /** 切换免打扰：同步会话的 silent 字段，避免会话列表 silent 图标等 1210 推到才更新 */
     async setSilent(friendUserId: number, silent: boolean) {
+      const requestEpoch = storeEpoch
       await apiUpdateFriend({ friendUserId, silent })
+      if (requestEpoch !== storeEpoch) {
+        return
+      }
       const friend = this.getFriend(friendUserId)
       if (friend) {
         friend.silent = silent
@@ -347,7 +376,11 @@ export const useFriendStore = defineStore('imFriendStore', {
 
     /** 切换联系人置顶 */
     async setPinned(friendUserId: number, pinned: boolean) {
+      const requestEpoch = storeEpoch
       await apiUpdateFriend({ friendUserId, pinned })
+      if (requestEpoch !== storeEpoch) {
+        return
+      }
       const friend = this.getFriend(friendUserId)
       if (friend) {
         friend.pinned = pinned
@@ -357,7 +390,11 @@ export const useFriendStore = defineStore('imFriendStore', {
 
     /** 拉黑好友：本端乐观更新 + 调接口；后端 FRIEND_BLOCK 推到时由 dispatcher 兜底同步多端 */
     async blockFriend(friendUserId: number) {
+      const requestEpoch = storeEpoch
       await apiBlockFriend(friendUserId)
+      if (requestEpoch !== storeEpoch) {
+        return
+      }
       const friend = this.getFriend(friendUserId)
       if (friend) {
         friend.blocked = true
@@ -367,7 +404,11 @@ export const useFriendStore = defineStore('imFriendStore', {
 
     /** 移出黑名单：本端乐观更新 + 调接口；后端 FRIEND_UNBLOCK 推到时由 dispatcher 兜底同步多端 */
     async unblockFriend(friendUserId: number) {
+      const requestEpoch = storeEpoch
       await apiUnblockFriend(friendUserId)
+      if (requestEpoch !== storeEpoch) {
+        return
+      }
       const friend = this.getFriend(friendUserId)
       if (friend) {
         friend.blocked = false
@@ -377,9 +418,13 @@ export const useFriendStore = defineStore('imFriendStore', {
 
     /** 修改好友展示备注（仅自己可见） */
     async setDisplayName(friendUserId: number, displayName: string) {
+      const requestEpoch = storeEpoch
       const value = displayName.trim()
       // 后端 displayName 语义：null/undefined = 不改，"" = 清空，所以这里直接传 value（可能是空串）
       await apiUpdateFriend({ friendUserId, displayName: value })
+      if (requestEpoch !== storeEpoch) {
+        return
+      }
       const friend = this.getFriend(friendUserId)
       if (friend) {
         friend.displayName = value