diff --git a/synapse/notifier.py b/synapse/notifier.py
index 40a148994f..b1de293dbc 100644
--- a/synapse/notifier.py
+++ b/synapse/notifier.py
@@ -20,6 +20,7 @@ from synapse.api.errors import AuthError
 from synapse.util.logutils import log_function
 from synapse.util.async import ObservableDeferred
 from synapse.util.logcontext import PreserveLoggingContext
+from synapse.util.metrics import Measure
 from synapse.types import StreamToken
 from synapse.visibility import filter_events_for_client
 import synapse.metrics
@@ -231,30 +232,32 @@ class Notifier(object):
         Will wake up all listeners for the given users and rooms.
         """
         with PreserveLoggingContext():
-            user_streams = set()
+            with Measure(self.clock, "on_new_event"):
+                user_streams = set()
 
-            for user in users:
-                user_stream = self.user_to_user_stream.get(str(user))
-                if user_stream is not None:
-                    user_streams.add(user_stream)
+                for user in users:
+                    user_stream = self.user_to_user_stream.get(str(user))
+                    if user_stream is not None:
+                        user_streams.add(user_stream)
 
-            for room in rooms:
-                user_streams |= self.room_to_user_streams.get(room, set())
+                for room in rooms:
+                    user_streams |= self.room_to_user_streams.get(room, set())
 
-            time_now_ms = self.clock.time_msec()
-            for user_stream in user_streams:
-                try:
-                    user_stream.notify(stream_key, new_token, time_now_ms)
-                except:
-                    logger.exception("Failed to notify listener")
+                time_now_ms = self.clock.time_msec()
+                for user_stream in user_streams:
+                    try:
+                        user_stream.notify(stream_key, new_token, time_now_ms)
+                    except:
+                        logger.exception("Failed to notify listener")
 
-            self.notify_replication()
+                self.notify_replication()
 
     def on_new_replication_data(self):
         """Used to inform replication listeners that something has happend
         without waking up any of the normal user event streams"""
         with PreserveLoggingContext():
-            self.notify_replication()
+            with Measure(self.clock, "on_new_replication_data"):
+                self.notify_replication()
 
     @defer.inlineCallbacks
     def wait_for_events(self, user_id, timeout, callback, room_ids=None,