diff --git a/lib/notification_factory/mailer.rb b/lib/notification_factory/mailer.rb
index e3037a221..bf201f924 100644
--- a/lib/notification_factory/mailer.rb
+++ b/lib/notification_factory/mailer.rb
@@ -30,10 +30,20 @@ returns
       type = map[type]
     end
 
-    return if !user.preferences
-    return if !user.preferences['notification_config']
+    # this cache will optimize the preference catch performance
+    # because of the yaml deserialization its pretty slow
+    # on many tickets you we cache it.
+    user_preferences = Cache.get("NotificationFactory::Mailer.notification_settings::#{user.id}")
+    if user_preferences.blank?
+      user_preferences = user.preferences
 
-    matrix = user.preferences['notification_config']['matrix']
+      Cache.write("NotificationFactory::Mailer.notification_settings::#{user.id}", user_preferences, expires_in: 20.seconds)
+    end
+
+    return if !user_preferences
+    return if !user_preferences['notification_config']
+
+    matrix = user_preferences['notification_config']['matrix']
     return if !matrix
 
     owned_by_nobody = false
@@ -60,7 +70,7 @@ returns
 
     # check if group is in selected groups
     if !owned_by_me
-      selected_group_ids = user.preferences['notification_config']['group_ids']
+      selected_group_ids = user_preferences['notification_config']['group_ids']
       if selected_group_ids.is_a?(Array)
         hit = nil
         if selected_group_ids.blank?
diff --git a/test/unit/notification_factory_mailer_test.rb b/test/unit/notification_factory_mailer_test.rb
index 12ef3d318..3089ac703 100644
--- a/test/unit/notification_factory_mailer_test.rb
+++ b/test/unit/notification_factory_mailer_test.rb
@@ -161,6 +161,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
 
     agent1.preferences[:notification_config][:group_ids] = nil
     agent1.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent1, ticket1, 'create')
     assert_equal(true, result[:channels][:online])
@@ -180,6 +181,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
 
     agent2.preferences[:notification_config][:group_ids] = nil
     agent2.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent2, ticket1, 'create')
     assert_equal(true, result[:channels][:online])
@@ -198,6 +200,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
     # no group selection
     agent1.preferences[:notification_config][:group_ids] = []
     agent1.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent1, ticket1, 'create')
     assert_equal(true, result[:channels][:online])
@@ -217,6 +220,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
 
     agent2.preferences[:notification_config][:group_ids] = []
     agent2.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent2, ticket1, 'create')
     assert_equal(true, result[:channels][:online])
@@ -234,6 +238,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
 
     agent1.preferences[:notification_config][:group_ids] = ['-']
     agent1.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent1, ticket1, 'create')
     assert_equal(true, result[:channels][:online])
@@ -253,6 +258,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
 
     agent2.preferences[:notification_config][:group_ids] = ['-']
     agent2.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent2, ticket1, 'create')
     assert_equal(true, result[:channels][:online])
@@ -271,6 +277,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
     # dedecated group selection
     agent1.preferences[:notification_config][:group_ids] = [Group.lookup(name: 'Users').id]
     agent1.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent1, ticket1, 'create')
     assert_equal(true, result[:channels][:online])
@@ -289,6 +296,7 @@ class NotificationFactoryMailerTest < ActiveSupport::TestCase
 
     agent2.preferences[:notification_config][:group_ids] = [Group.lookup(name: 'Users').id]
     agent2.save
+    travel 30.seconds
 
     result = NotificationFactory::Mailer.notification_settings(agent2, ticket1, 'create')
     assert_equal(true, result[:channels][:online])