diff --git a/changelog.d/17771.misc b/changelog.d/17771.misc
new file mode 100644
index 00000000000..be28223151d
--- /dev/null
+++ b/changelog.d/17771.misc
@@ -0,0 +1 @@
+Reduce overhead of sliding sync E2EE loops.
diff --git a/synapse/api/auth/msc3861_delegated.py b/synapse/api/auth/msc3861_delegated.py
index 6bd845c7e30..53907c01d43 100644
--- a/synapse/api/auth/msc3861_delegated.py
+++ b/synapse/api/auth/msc3861_delegated.py
@@ -338,7 +338,7 @@ async def get_user_by_access_token(
             logger.exception("Failed to introspect token")
             raise SynapseError(503, "Unable to introspect the access token")
 
-        logger.info(f"Introspection result: {introspection_result!r}")
+        logger.debug("Introspection result: %r", introspection_result)
 
         # TODO: introspection verification should be more extensive, especially:
         #   - verify the audience
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index 4f2a9f3a5bb..d88660e273b 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -48,6 +48,7 @@
     wrap_as_background_process,
 )
 from synapse.storage.databases.main.client_ips import DeviceLastConnectionInfo
+from synapse.storage.databases.main.roommember import EventIdMembership
 from synapse.storage.databases.main.state_deltas import StateDelta
 from synapse.types import (
     DeviceListUpdates,
@@ -222,7 +223,6 @@ async def get_device_changes_in_shared_rooms(
         return changed
 
     @trace
-    @measure_func("device.get_user_ids_changed")
     @cancellable
     async def get_user_ids_changed(
         self, user_id: str, from_token: StreamToken
@@ -290,9 +290,11 @@ async def get_user_ids_changed(
                 memberships_to_fetch.add(delta.prev_event_id)
 
         # Fetch all the memberships for the membership events
-        event_id_to_memberships = await self.store.get_membership_from_event_ids(
-            memberships_to_fetch
-        )
+        event_id_to_memberships: Mapping[str, Optional[EventIdMembership]] = {}
+        if memberships_to_fetch:
+            event_id_to_memberships = await self.store.get_membership_from_event_ids(
+                memberships_to_fetch
+            )
 
         joined_invited_knocked = (
             Membership.JOIN,
@@ -349,7 +351,6 @@ async def get_user_ids_changed(
 
         return device_list_updates
 
-    @measure_func("_generate_sync_entry_for_device_list")
     async def generate_sync_entry_for_device_list(
         self,
         user_id: str,