diff --git a/app/jobs/scheduled/calculate_avg_time.rb b/app/jobs/scheduled/calculate_avg_time.rb
new file mode 100644
index 00000000000..e842285ab4a
--- /dev/null
+++ b/app/jobs/scheduled/calculate_avg_time.rb
@@ -0,0 +1,15 @@
+module Jobs
+
+  class CalculateAvgTime < Jobs::Scheduled
+    every 1.day
+
+    # PERF: these calculations can become exceedingly expnsive
+    #  they run a huge gemoetric mean and are hard to optimise
+    #  defer to only run once a day
+    def execute(args)
+      # Update the average times
+      Post.calculate_avg_time(2.days.ago)
+      Topic.calculate_avg_time(2.days.ago)
+    end
+  end
+end
diff --git a/app/jobs/scheduled/periodical_updates.rb b/app/jobs/scheduled/periodical_updates.rb
index 27aaac4d433..2266ca17f2e 100644
--- a/app/jobs/scheduled/periodical_updates.rb
+++ b/app/jobs/scheduled/periodical_updates.rb
@@ -8,9 +8,6 @@ module Jobs
     every 15.minutes
 
     def execute(args)
-      # Update the average times
-      Post.calculate_avg_time(1.day.ago)
-      Topic.calculate_avg_time(1.day.ago)
 
       # Feature topics in categories
       CategoryFeaturedTopic.feature_topics