diff --git a/lib/shared/dm-ops/dm-op-utils.js b/lib/shared/dm-ops/dm-op-utils.js
--- a/lib/shared/dm-ops/dm-op-utils.js
+++ b/lib/shared/dm-ops/dm-op-utils.js
@@ -12,6 +12,7 @@
 import { useLoggedInUserInfo } from '../../hooks/account-hooks.js';
 import { useGetLatestMessageEdit } from '../../hooks/latest-message-edit.js';
 import { mergeUpdatesWithMessageInfos } from '../../reducers/message-reducer.js';
+import { getAllPeerUserIDAndDeviceIDs } from '../../selectors/user-selectors.js';
 import type {
   CreateThickRawThreadInfoInput,
   DMAddMembersOperation,
@@ -117,58 +118,64 @@
   | OutboundDMOperationSpecification
   | InboundDMOperationSpecification;
 
-async function createMessagesToPeersFromDMOp(
+function useCreateMessagesToPeersFromDMOp(): (
   operation: DMOperation,
   recipients: OutboundDMOperationSpecificationRecipients,
-  allPeerUserIDAndDeviceIDs: $ReadOnlyArray<{
-    +userID: string,
-    +deviceID: string,
-  }>,
-  utilities: ProcessDMOperationUtilities,
-): Promise<$ReadOnlyArray<OutboundP2PMessage>> {
-  const { viewerID, threadInfos } = utilities;
-  if (!viewerID) {
-    return [];
-  }
+) => Promise<$ReadOnlyArray<OutboundP2PMessage>> {
+  const allPeerUserIDAndDeviceIDs = useSelector(getAllPeerUserIDAndDeviceIDs);
+  const utilities = useSendDMOperationUtils();
 
-  let peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs;
-  if (recipients.type === 'self_devices') {
-    peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(
-      peer => peer.userID === viewerID,
-    );
-  } else if (recipients.type === 'some_users') {
-    const userIDs = new Set(recipients.userIDs);
-    peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(peer =>
-      userIDs.has(peer.userID),
-    );
-  } else if (recipients.type === 'all_thread_members') {
-    const { threadID } = recipients;
-    if (!threadInfos[threadID]) {
-      console.log(
-        `all_thread_members called for threadID ${threadID}, which is ` +
-          'missing from the ThreadStore. if sending a message soon after ' +
-          'thread creation, consider some_users instead',
+  return React.useCallback(
+    async (
+      operation: DMOperation,
+      recipients: OutboundDMOperationSpecificationRecipients,
+    ): Promise<$ReadOnlyArray<OutboundP2PMessage>> => {
+      const { viewerID, threadInfos } = utilities;
+      if (!viewerID) {
+        return [];
+      }
+
+      let peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs;
+      if (recipients.type === 'self_devices') {
+        peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(
+          peer => peer.userID === viewerID,
+        );
+      } else if (recipients.type === 'some_users') {
+        const userIDs = new Set(recipients.userIDs);
+        peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(peer =>
+          userIDs.has(peer.userID),
+        );
+      } else if (recipients.type === 'all_thread_members') {
+        const { threadID } = recipients;
+        if (!threadInfos[threadID]) {
+          console.log(
+            `all_thread_members called for threadID ${threadID}, which is ` +
+              'missing from the ThreadStore. if sending a message soon after ' +
+              'thread creation, consider some_users instead',
+          );
+        }
+        const members = threadInfos[recipients.threadID]?.members ?? [];
+        const memberIDs = members.map(member => member.id);
+
+        const userIDs = new Set(memberIDs);
+        peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(peer =>
+          userIDs.has(peer.userID),
+        );
+      } else if (recipients.type === 'some_devices') {
+        const deviceIDs = new Set(recipients.deviceIDs);
+        peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(peer =>
+          deviceIDs.has(peer.deviceID),
+        );
+      }
+
+      const thisDeviceID = await getContentSigningKey();
+      const targetPeers = peerUserIDAndDeviceIDs.filter(
+        peer => peer.deviceID !== thisDeviceID,
       );
-    }
-    const members = threadInfos[recipients.threadID]?.members ?? [];
-    const memberIDs = members.map(member => member.id);
-
-    const userIDs = new Set(memberIDs);
-    peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(peer =>
-      userIDs.has(peer.userID),
-    );
-  } else if (recipients.type === 'some_devices') {
-    const deviceIDs = new Set(recipients.deviceIDs);
-    peerUserIDAndDeviceIDs = allPeerUserIDAndDeviceIDs.filter(peer =>
-      deviceIDs.has(peer.deviceID),
-    );
-  }
-
-  const thisDeviceID = await getContentSigningKey();
-  const targetPeers = peerUserIDAndDeviceIDs.filter(
-    peer => peer.deviceID !== thisDeviceID,
+      return generateMessagesToPeers(operation, targetPeers);
+    },
+    [allPeerUserIDAndDeviceIDs, utilities],
   );
-  return generateMessagesToPeers(operation, targetPeers);
 }
 
 function getCreateThickRawThreadInfoInputFromThreadInfo(
@@ -385,7 +392,7 @@
 }
 
 export {
-  createMessagesToPeersFromDMOp,
+  useCreateMessagesToPeersFromDMOp,
   useAddDMThreadMembers,
   getCreateThickRawThreadInfoInputFromThreadInfo,
   getThreadUpdatesForNewMessages,
diff --git a/lib/shared/dm-ops/process-dm-ops.js b/lib/shared/dm-ops/process-dm-ops.js
--- a/lib/shared/dm-ops/process-dm-ops.js
+++ b/lib/shared/dm-ops/process-dm-ops.js
@@ -8,7 +8,7 @@
 import {
   type OutboundDMOperationSpecification,
   type DMOperationSpecification,
-  createMessagesToPeersFromDMOp,
+  useCreateMessagesToPeersFromDMOp,
   dmOperationSpecificationTypes,
   type OutboundComposableDMOperationSpecification,
   getThreadUpdatesForNewMessages,
@@ -17,7 +17,6 @@
 import { useProcessBlobHolders } from '../../actions/holder-actions.js';
 import { processNewUserIDsActionType } from '../../actions/user-actions.js';
 import { useDispatchWithMetadata } from '../../hooks/ops-hooks.js';
-import { getAllPeerUserIDAndDeviceIDs } from '../../selectors/user-selectors.js';
 import {
   usePeerToPeerCommunication,
   type ProcessOutboundP2PMessagesResult,
@@ -39,8 +38,8 @@
 ) => Promise<void> {
   const baseUtilities = useSendDMOperationUtils();
   const dispatchWithMetadata = useDispatchWithMetadata();
-  const allPeerUserIDAndDeviceIDs = useSelector(getAllPeerUserIDAndDeviceIDs);
   const processBlobHolders = useProcessBlobHolders();
+  const createMessagesToPeersFromDMOp = useCreateMessagesToPeersFromDMOp();
 
   const dispatch = useDispatch();
 
@@ -68,8 +67,6 @@
         outboundP2PMessages = await createMessagesToPeersFromDMOp(
           dmOp,
           dmOperationSpecification.recipients,
-          allPeerUserIDAndDeviceIDs,
-          utilities,
         );
       }
 
@@ -238,10 +235,10 @@
     },
     [
       baseUtilities,
+      processBlobHolders,
       dispatchWithMetadata,
-      allPeerUserIDAndDeviceIDs,
+      createMessagesToPeersFromDMOp,
       dispatch,
-      processBlobHolders,
     ],
   );
 }
@@ -267,10 +264,10 @@
 ) => Promise<ProcessOutboundP2PMessagesResult> {
   const { getDMOpsSendingPromise } = usePeerToPeerCommunication();
   const dispatchWithMetadata = useDispatchWithMetadata();
-  const allPeerUserIDAndDeviceIDs = useSelector(getAllPeerUserIDAndDeviceIDs);
   const baseUtilities = useSendDMOperationUtils();
   const { processOutboundMessages } = usePeerToPeerCommunication();
   const localMessageInfos = useSelector(state => state.messageStore.local);
+  const createMessagesToPeersFromDMOp = useCreateMessagesToPeersFromDMOp();
 
   return React.useCallback(
     async (
@@ -317,8 +314,6 @@
       const outboundP2PMessages = await createMessagesToPeersFromDMOp(
         op,
         recipients,
-        allPeerUserIDAndDeviceIDs,
-        utilities,
       );
 
       const spec = dmOpSpecs[op.type];
@@ -372,12 +367,12 @@
       }
     },
     [
-      allPeerUserIDAndDeviceIDs,
-      dispatchWithMetadata,
+      baseUtilities,
       getDMOpsSendingPromise,
       localMessageInfos,
+      createMessagesToPeersFromDMOp,
+      dispatchWithMetadata,
       processOutboundMessages,
-      baseUtilities,
     ],
   );
 }