diff --git a/synapse/storage/databases/main/event_federation.py b/synapse/storage/databases/main/event_federation.py
index 29fb5b7b66..afffa54985 100644
--- a/synapse/storage/databases/main/event_federation.py
+++ b/synapse/storage/databases/main/event_federation.py
@@ -54,7 +54,6 @@ from synapse.util.caches.descriptors import cached
 from synapse.util.caches.lrucache import LruCache
 from synapse.util.cancellation import cancellable
 from synapse.util.iterutils import batch_iter
-from synapse.util.metrics import Measure
 
 if TYPE_CHECKING:
     from synapse.server import HomeServer
@@ -414,22 +413,12 @@ class EventFederationWorkerStore(SignatureWorkerStore, EventsWorkerStore, SQLBas
         room = await self.get_room(room_id)  # type: ignore[attr-defined]
         if room["has_auth_chain_index"]:
             try:
-                with Measure(self.hs.get_clock(), "rei:get_auth_chain_difference_chains") as m:
-                    r = await self.db_pool.runInteraction(
-                        "get_auth_chain_difference_chains",
-                        self._get_auth_chain_difference_using_cover_index_txn,
-                        room_id,
-                        state_sets,
-                    )
-                    if m.get_resource_usage().ru_utime > 4.0:
-                        logger.info(
-                            "REI-ACDC %.2f, ri=%r ss=%r",
-                            m.get_resource_usage().ru_utime,
-                            room_id,
-                            state_sets
-                        )
-                    return r
-
+                return await self.db_pool.runInteraction(
+                    "get_auth_chain_difference_chains",
+                    self._get_auth_chain_difference_using_cover_index_txn,
+                    room_id,
+                    state_sets,
+                )
             except _NoChainCoverIndex:
                 # For whatever reason we don't actually have a chain cover index
                 # for the events in question, so we fall back to the old method.