diff --git a/lib/hooks/search-threads.js b/lib/hooks/search-threads.js
--- a/lib/hooks/search-threads.js
+++ b/lib/hooks/search-threads.js
@@ -2,12 +2,12 @@
 
 import * as React from 'react';
 
+import { useSidebarInfos } from './sidebar-hooks.js';
 import {
   type ChatThreadItem,
   useFilteredChatListData,
 } from '../selectors/chat-selectors.js';
 import { useThreadSearchIndex } from '../selectors/nav-selectors.js';
-import { sidebarInfoSelector } from '../selectors/sidebar-selectors.js';
 import { threadIsChannel } from '../shared/thread-utils.js';
 import type { SetState } from '../types/hook-types.js';
 import type {
@@ -15,7 +15,6 @@
   RawThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
 import type { SidebarInfo } from '../types/thread-types.js';
-import { useSelector } from '../utils/redux-utils.js';
 
 export type ThreadSearchState = {
   +text: string,
@@ -90,12 +89,13 @@
   );
 }
 
+const emptyArray: $ReadOnlyArray<SidebarInfo> = [];
+
 function useSearchSidebars(
   threadInfo: ThreadInfo,
 ): SearchThreadsResult<SidebarInfo> {
-  const childThreadInfos = useSelector(
-    state => sidebarInfoSelector(state)[threadInfo.id] ?? [],
-  );
+  const sidebarsByParentID = useSidebarInfos();
+  const childThreadInfos = sidebarsByParentID[threadInfo.id] ?? emptyArray;
   return useSearchThreads(threadInfo, childThreadInfos);
 }
 
diff --git a/lib/hooks/sidebar-hooks.js b/lib/hooks/sidebar-hooks.js
new file mode 100644
--- /dev/null
+++ b/lib/hooks/sidebar-hooks.js
@@ -0,0 +1,67 @@
+// @flow
+
+import _orderBy from 'lodash/fp/orderBy.js';
+import * as React from 'react';
+
+import { childThreadInfos } from '../selectors/thread-selectors.js';
+import { getMostRecentNonLocalMessageID } from '../shared/message-utils.js';
+import { threadInChatList } from '../shared/thread-utils.js';
+import type { MessageStore, RawMessageInfo } from '../types/message-types.js';
+import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
+import { threadTypeIsSidebar } from '../types/thread-types-enum.js';
+import type { SidebarInfo } from '../types/thread-types.js';
+import { useSelector } from '../utils/redux-utils.js';
+
+function getMostRecentRawMessageInfo(
+  threadInfo: ThreadInfo,
+  messageStore: MessageStore,
+): ?RawMessageInfo {
+  const thread = messageStore.threads[threadInfo.id];
+  if (!thread) {
+    return null;
+  }
+  for (const messageID of thread.messageIDs) {
+    return messageStore.messages[messageID];
+  }
+  return null;
+}
+
+function useSidebarInfos(): { +[id: string]: $ReadOnlyArray<SidebarInfo> } {
+  const childThreadInfoByParentID = useSelector(childThreadInfos);
+  const messageStore = useSelector(state => state.messageStore);
+
+  return React.useMemo(() => {
+    const result: { [id: string]: $ReadOnlyArray<SidebarInfo> } = {};
+    for (const parentID in childThreadInfoByParentID) {
+      const childThreads = childThreadInfoByParentID[parentID];
+      const sidebarInfos = [];
+      for (const childThreadInfo of childThreads) {
+        if (
+          !threadInChatList(childThreadInfo) ||
+          !threadTypeIsSidebar(childThreadInfo.type)
+        ) {
+          continue;
+        }
+        const mostRecentRawMessageInfo = getMostRecentRawMessageInfo(
+          childThreadInfo,
+          messageStore,
+        );
+        const lastUpdatedTime =
+          mostRecentRawMessageInfo?.time ?? childThreadInfo.creationTime;
+        const mostRecentNonLocalMessage = getMostRecentNonLocalMessageID(
+          childThreadInfo.id,
+          messageStore,
+        );
+        sidebarInfos.push({
+          threadInfo: childThreadInfo,
+          lastUpdatedTime,
+          mostRecentNonLocalMessage,
+        });
+      }
+      result[parentID] = _orderBy('lastUpdatedTime')('desc')(sidebarInfos);
+    }
+    return result;
+  }, [childThreadInfoByParentID, messageStore]);
+}
+
+export { useSidebarInfos };
diff --git a/lib/selectors/chat-selectors.js b/lib/selectors/chat-selectors.js
--- a/lib/selectors/chat-selectors.js
+++ b/lib/selectors/chat-selectors.js
@@ -13,7 +13,7 @@
   threadInfoFromSourceMessageIDSelector,
   threadInfoSelector,
 } from './thread-selectors.js';
-import { sidebarInfoSelector } from '../selectors/sidebar-selectors.js';
+import { useSidebarInfos } from '../hooks/sidebar-hooks.js';
 import {
   createMessageInfo,
   getMostRecentNonLocalMessageID,
@@ -113,7 +113,7 @@
 
 function useCreateChatThreadItem(): ThreadInfo => ChatThreadItem {
   const messageInfos = useSelector(messageInfoSelector);
-  const sidebarInfos = useSelector(sidebarInfoSelector);
+  const sidebarInfos = useSidebarInfos();
   const messageStore = useSelector(state => state.messageStore);
   return React.useCallback(
     threadInfo => {
diff --git a/lib/selectors/sidebar-selectors.js b/lib/selectors/sidebar-selectors.js
deleted file mode 100644
--- a/lib/selectors/sidebar-selectors.js
+++ /dev/null
@@ -1,63 +0,0 @@
-// @flow
-
-import _orderBy from 'lodash/fp/orderBy.js';
-import { createObjectSelector } from 'reselect-map';
-
-import { childThreadInfos } from './thread-selectors.js';
-import { getMostRecentNonLocalMessageID } from '../shared/message-utils.js';
-import { threadInChatList } from '../shared/thread-utils.js';
-import type { MessageStore, RawMessageInfo } from '../types/message-types.js';
-import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
-import type { BaseAppState } from '../types/redux-types.js';
-import { threadTypeIsSidebar } from '../types/thread-types-enum.js';
-import type { SidebarInfo } from '../types/thread-types.js';
-
-function getMostRecentRawMessageInfo(
-  threadInfo: ThreadInfo,
-  messageStore: MessageStore,
-): ?RawMessageInfo {
-  const thread = messageStore.threads[threadInfo.id];
-  if (!thread) {
-    return null;
-  }
-  for (const messageID of thread.messageIDs) {
-    return messageStore.messages[messageID];
-  }
-  return null;
-}
-
-const sidebarInfoSelector: (state: BaseAppState<>) => {
-  +[id: string]: $ReadOnlyArray<SidebarInfo>,
-} = createObjectSelector(
-  childThreadInfos,
-  (state: BaseAppState<>) => state.messageStore,
-  (childThreads: $ReadOnlyArray<ThreadInfo>, messageStore: MessageStore) => {
-    const sidebarInfos = [];
-    for (const childThreadInfo of childThreads) {
-      if (
-        !threadInChatList(childThreadInfo) ||
-        !threadTypeIsSidebar(childThreadInfo.type)
-      ) {
-        continue;
-      }
-      const mostRecentRawMessageInfo = getMostRecentRawMessageInfo(
-        childThreadInfo,
-        messageStore,
-      );
-      const lastUpdatedTime =
-        mostRecentRawMessageInfo?.time ?? childThreadInfo.creationTime;
-      const mostRecentNonLocalMessage = getMostRecentNonLocalMessageID(
-        childThreadInfo.id,
-        messageStore,
-      );
-      sidebarInfos.push({
-        threadInfo: childThreadInfo,
-        lastUpdatedTime,
-        mostRecentNonLocalMessage,
-      });
-    }
-    return _orderBy('lastUpdatedTime')('desc')(sidebarInfos);
-  },
-);
-
-export { sidebarInfoSelector };