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-rw-r--r--changelog.d/12557.misc1
-rw-r--r--synapse/handlers/device.py5
-rw-r--r--synapse/storage/databases/main/devices.py3
-rw-r--r--tests/storage/test_devices.py2
4 files changed, 7 insertions, 4 deletions
diff --git a/changelog.d/12557.misc b/changelog.d/12557.misc
new file mode 100644
index 0000000000..e4eb895ef5
--- /dev/null
+++ b/changelog.d/12557.misc
@@ -0,0 +1 @@
+Reduce unnecessary work when handling remote device list updates.
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index 319836da2b..a91b1ee4d5 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -505,8 +505,9 @@ class DeviceHandler(DeviceWorkerHandler):
             "device_list_key", position, users={user_id}, rooms=room_ids
         )
 
-        # We may need to do some processing asynchronously.
-        self._handle_new_device_update_async()
+        # We may need to do some processing asynchronously for local user IDs.
+        if self.hs.is_mine_id(user_id):
+            self._handle_new_device_update_async()
 
     async def notify_user_signature_update(
         self, from_user_id: str, user_ids: List[str]
diff --git a/synapse/storage/databases/main/devices.py b/synapse/storage/databases/main/devices.py
index 59d223a900..483dd80406 100644
--- a/synapse/storage/databases/main/devices.py
+++ b/synapse/storage/databases/main/devices.py
@@ -1748,7 +1748,8 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
                     device_id,
                     room_id,
                     stream_id,
-                    False,
+                    # We only need to calculate outbound pokes for local users
+                    not self.hs.is_mine_id(user_id),
                     encoded_context,
                 )
                 for room_id in room_ids
diff --git a/tests/storage/test_devices.py b/tests/storage/test_devices.py
index ccc3893869..bbf079b25b 100644
--- a/tests/storage/test_devices.py
+++ b/tests/storage/test_devices.py
@@ -29,7 +29,7 @@ class DeviceStoreTestCase(HomeserverTestCase):
         for device_id in device_ids:
             stream_id = self.get_success(
                 self.store.add_device_change_to_streams(
-                    "user_id", [device_id], ["!some:room"]
+                    user_id, [device_id], ["!some:room"]
                 )
             )