diff --git a/contrib/systemd/log_config.yaml b/contrib/systemd/log_config.yaml
index e16fb5456a..d85bdd1208 100644
--- a/contrib/systemd/log_config.yaml
+++ b/contrib/systemd/log_config.yaml
@@ -21,3 +21,5 @@ handlers:
 root:
     level: INFO
     handlers: [journal]
+
+disable_existing_loggers: False
diff --git a/synapse/config/captcha.py b/synapse/config/captcha.py
index d8fe577e34..ba221121cb 100644
--- a/synapse/config/captcha.py
+++ b/synapse/config/captcha.py
@@ -26,6 +26,7 @@ class CaptchaConfig(Config):
             config["captcha_ip_origin_is_x_forwarded"]
         )
         self.captcha_bypass_secret = config.get("captcha_bypass_secret")
+        self.recaptcha_siteverify_api = config["recaptcha_siteverify_api"]
 
     def default_config(self, config_dir_path, server_name):
         return """\
@@ -48,4 +49,7 @@ class CaptchaConfig(Config):
 
         # A secret key used to bypass the captcha test entirely.
         #captcha_bypass_secret: "YOUR_SECRET_HERE"
+
+        # The API endpoint to use for verifying m.login.recaptcha responses.
+        recaptcha_siteverify_api: "https://www.google.com/recaptcha/api/siteverify"
         """
diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index b2a904b408..39ce4f7c42 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -131,7 +131,7 @@ class FrozenEvent(EventBase):
         if USE_FROZEN_DICTS:
             frozen_dict = freeze(event_dict)
         else:
-            frozen_dict = dict(event_dict)
+            frozen_dict = event_dict
 
         super(FrozenEvent, self).__init__(
             frozen_dict,
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 0cc28248a9..63071653a3 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -188,7 +188,7 @@ class AuthHandler(BaseHandler):
         try:
             client = SimpleHttpClient(self.hs)
             resp_body = yield client.post_urlencoded_get_json(
-                "https://www.google.com/recaptcha/api/siteverify",
+                self.hs.config.recaptcha_siteverify_api,
                 args={
                     'secret': self.hs.config.recaptcha_private_key,
                     'response': user_response,
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 4bd027d9bb..31efba0a9c 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -254,9 +254,7 @@ class RoomMemberHandler(BaseHandler):
 
     @defer.inlineCallbacks
     def get_room_members(self, room_id):
-        users = yield self.store.get_users_in_room(room_id)
-
-        defer.returnValue([UserID.from_string(u) for u in users])
+        return self.store.get_user_objs_in_room(room_id)
 
     @defer.inlineCallbacks
     def fetch_room_distributions_into(self, room_id, localusers=None,
diff --git a/synapse/http/server.py b/synapse/http/server.py
index cdb9f9cefc..ae8f3b3972 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -290,7 +290,6 @@ def respond_with_json(request, code, json_object, send_cors=False,
             json_bytes = encode_json(
                 json_object, using_frozen_dicts=synapse.events.USE_FROZEN_DICTS
             )
-            logger.debug("json_bytes: %r %r", json_object, json_bytes)
 
     return respond_with_json_bytes(
         request, code, json_bytes,
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 20a8d81794..79cb52beb0 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -128,6 +128,7 @@ class EventsStore(SQLBaseStore):
             txn.call_after(self.get_current_state_for_key.invalidate_all)
             txn.call_after(self.get_rooms_for_user.invalidate_all)
             txn.call_after(self.get_users_in_room.invalidate, event.room_id)
+            txn.call_after(self.get_user_objs_in_room.invalidate, event.room_id)
             txn.call_after(self.get_joined_hosts_for_room.invalidate, event.room_id)
             txn.call_after(self.get_room_name_and_aliases, event.room_id)
 
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index d36a6c18a8..2c879d56d6 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -67,6 +67,7 @@ class RoomMemberStore(SQLBaseStore):
         txn.call_after(self.get_rooms_for_user.invalidate, target_user_id)
         txn.call_after(self.get_joined_hosts_for_room.invalidate, event.room_id)
         txn.call_after(self.get_users_in_room.invalidate, event.room_id)
+        txn.call_after(self.get_user_objs_in_room.invalidate, event.room_id)
 
     def get_room_member(self, user_id, room_id):
         """Retrieve the current state of a room member.
@@ -101,6 +102,12 @@ class RoomMemberStore(SQLBaseStore):
             return [r["user_id"] for r in rows]
         return self.runInteraction("get_users_in_room", f)
 
+    @cached()
+    def get_user_objs_in_room(self, room_id):
+        return self.get_users_in_room(room_id).addCallback(
+            lambda users: [UserID.from_string(u) for u in users]
+        )
+
     def get_room_members(self, room_id, membership=None):
         """Retrieve the current room member list for a room.