diff --git a/app/helpers/action_cable_helper.rb b/app/helpers/action_cable_helper.rb
index 4c22424c..4422a7cb 100644
--- a/app/helpers/action_cable_helper.rb
+++ b/app/helpers/action_cable_helper.rb
@@ -1,15 +1,17 @@
 module ActionCableHelper
-  def trigger_rfc_action_cable
+def trigger_rfc_action_cable
+  Thread.new do
     # Context: RfC
     if submission.study_group_id.present?
       ActionCable.server.broadcast(
-        "la_exercises_#{exercise_id}_channel_study_group_#{submission.study_group_id}",
-        type: :rfc,
-        id: id,
-        html: (ApplicationController.render(partial: 'request_for_comments/list_entry',
-                                            locals: {request_for_comment: self})))
+          "la_exercises_#{exercise_id}_channel_study_group_#{submission.study_group_id}",
+          type: :rfc,
+          id: id,
+          html: (ApplicationController.render(partial: 'request_for_comments/list_entry',
+                                              locals: {request_for_comment: self})))
     end
   end
+end
 
   def trigger_rfc_action_cable_from_comment
     # Context: Comment
@@ -17,12 +19,14 @@ module ActionCableHelper
   end
 
   def trigger_working_times_action_cable
-    # Context: Submission
-    if study_group_id.present?
-      ActionCable.server.broadcast(
-          "la_exercises_#{exercise_id}_channel_study_group_#{study_group_id}",
-          type: :working_times,
-          working_time_data: exercise.get_working_times_for_study_group(study_group_id, user))
+    Thread.new do
+      # Context: Submission
+      if study_group_id.present?
+        ActionCable.server.broadcast(
+            "la_exercises_#{exercise_id}_channel_study_group_#{study_group_id}",
+            type: :working_times,
+            working_time_data: exercise.get_working_times_for_study_group(study_group_id, user))
+      end
     end
   end
 end
diff --git a/app/models/exercise.rb b/app/models/exercise.rb
index 673903b6..68465934 100644
--- a/app/models/exercise.rb
+++ b/app/models/exercise.rb
@@ -198,7 +198,7 @@ class Exercise < ApplicationRecord
   def get_working_times_for_study_group(study_group_id, user = nil)
     user_progress = []
     additional_user_data = []
-    max_bucket = 4
+    max_bucket = 100
     maximum_score = self.maximum_score
 
     if user.blank?
@@ -209,7 +209,7 @@ class Exercise < ApplicationRecord
 
     results = self.class.connection.execute(study_group_working_time_query(id, study_group_id, additional_filter)).each do |tuple|
       if tuple['score'] <= maximum_score
-        bucket = tuple['score'] / maximum_score * max_bucket
+        bucket = (tuple['score'] / maximum_score * max_bucket).round
       else
         bucket = max_bucket # maximum_score / maximum_score will always be 1
       end