diff --git a/plexpy/__init__.py b/plexpy/__init__.py
index 861ff8fc..b11f46d7 100644
--- a/plexpy/__init__.py
+++ b/plexpy/__init__.py
@@ -548,6 +548,8 @@ def start():
     global _STARTED
 
     if _INITIALIZED:
+        logger.filter_usernames()
+
         # Start refreshes on a separate thread
         threading.Thread(target=startup_refresh).start()
 
diff --git a/plexpy/logger.py b/plexpy/logger.py
index 5a1c0f0f..a1631610 100644
--- a/plexpy/logger.py
+++ b/plexpy/logger.py
@@ -46,6 +46,7 @@ MAX_SIZE = 5000000  # 5 MB
 MAX_FILES = 5
 
 _BLACKLIST_WORDS = set()
+_FILTER_USERNAMES = []
 
 # Tautulli logger
 logger = logging.getLogger("tautulli")
@@ -71,6 +72,19 @@ def blacklist_config(config):
     _BLACKLIST_WORDS.update(blacklist)
 
 
+def filter_usernames(new_users=None):
+    global _FILTER_USERNAMES
+
+    if new_users is None:
+        new_users = [user['username'] for user in users.Users().get_users()]
+
+    for username in new_users:
+        if username.lower() not in ('local', 'guest') and username not in _FILTER_USERNAMES:
+            _FILTER_USERNAMES.append(username)
+
+    _FILTER_USERNAMES = sorted(_FILTER_USERNAMES, key=len, reverse=True)
+
+
 class NoThreadFilter(logging.Filter):
     """
     Log filter for the current thread
@@ -126,18 +140,7 @@ class UsernameFilter(logging.Filter):
         if not plexpy._INITIALIZED:
             return True
 
-        items = sorted(
-            users.Users().get_users(),
-            key=lambda x: len(x['username']),
-            reverse=True
-        )
-
-        for item in items:
-            username = item['username']
-
-            if username.lower() in ('local', 'guest'):
-                continue
-
+        for username in _FILTER_USERNAMES:
             try:
                 record.msg = self.replace(record.msg, username)
 
diff --git a/plexpy/users.py b/plexpy/users.py
index 2c988050..5ec093ff 100644
--- a/plexpy/users.py
+++ b/plexpy/users.py
@@ -60,6 +60,7 @@ def refresh_users():
 
         # Keep track of user_id to update is_active status
         user_ids = [0]  # Local user always considered active
+        new_users = []
 
         for item in result:
             user_ids.append(helpers.cast_to_int(item['user_id']))
@@ -92,11 +93,17 @@ def refresh_users():
             if not item['username']:
                 item['username'] = item['title']
 
-            monitor_db.upsert('users', key_dict=keys_dict, value_dict=item)
+            result = monitor_db.upsert('users', key_dict=keys_dict, value_dict=item)
+
+            if result == 'insert':
+                new_users.append(item['username'])
 
         query = 'UPDATE users SET is_active = 0 WHERE user_id NOT IN ({})'.format(', '.join(['?'] * len(user_ids)))
         monitor_db.action(query=query, args=user_ids)
 
+        # Add new users to loger username filter
+        logger.filter_usernames(new_users)
+
         logger.info("Tautulli Users :: Users list refreshed.")
         return True
     else: