diff --git a/app/jobs/concerns/recursive_rollup.rb b/app/jobs/concerns/recursive_rollup.rb
index 3539d7d2..28c2e66a 100644
--- a/app/jobs/concerns/recursive_rollup.rb
+++ b/app/jobs/concerns/recursive_rollup.rb
@@ -46,6 +46,30 @@ module RecursiveRollup
             end
     end
 
+    # Reducir las estadísticas calculadas aplicando un rollup sobre el
+    # intervalo más amplio.
+    #
+    # @param :name [String]
+    # @param :beginning [Time]
+    # @param :operation [Symbol]
+    # @param :dimensions [Hash]
+    # @return [nil]
+    def reduce_rollup(name, beginning, operation, **dimensions)
+      Stat::INTERVALS.reduce do |previous, current|
+        recursive_rollup(name: name,
+                         interval_previous: previous,
+                         interval: current,
+                         dimensions: dimensions,
+                         beginning: beginning,
+                         operation: operation)
+
+        # Devolver el intervalo actual
+        current
+      end
+
+      nil
+    end
+
     # @param :dimensions [Hash]
     # @return [Array]
     def dimensions_to_jsonb_query(dimensions)
diff --git a/app/jobs/stat_collection_job.rb b/app/jobs/stat_collection_job.rb
index a67a3c50..65226b5c 100644
--- a/app/jobs/stat_collection_job.rb
+++ b/app/jobs/stat_collection_job.rb
@@ -9,10 +9,8 @@ class StatCollectionJob < PeriodicJob
 
   def perform(site_id:, once: true)
     @site = Site.find site_id
-
-    # Registrar que se hicieron todas las recolecciones
-    stat = site.stats.create! name: STAT_NAME
     beginning = beginning_of_interval
+    stat = site.stats.create! name: STAT_NAME
 
     scope.rollup('builds', **options)
 
@@ -24,16 +22,9 @@ class StatCollectionJob < PeriodicJob
       rollup.average(:seconds)
     end
 
-    # XXX: Es correcto promediar promedios?
-    Stat::INTERVALS.reduce do |previous, current|
-      opts = { interval_previous: previous, interval: current, beginning: beginning, dimensions: { site_id: site.id } }
-
-      recursive_rollup(name: 'builds', **opts)
-      recursive_rollup(name: 'space_used', operation: :average, **opts)
-      recursive_rollup(name: 'build_time', operation: :average, **opts)
-
-      current
-    end
+    reduce_rollup('builds', beginning, :sum, site_id: site_id)
+    reduce_rollup('space_used', beginning, :average, site_id: site_id)
+    reduce_rollup('build_time', beginning, :average, site_id: site_id)
 
     stat.touch
     run_again! unless once
@@ -45,10 +36,7 @@ class StatCollectionJob < PeriodicJob
   #
   # @return [ActiveRecord::Relation]
   def scope
-    @scope ||= site.build_stats
-                   .jekyll
-                   .where('created_at >= ?', beginning_of_interval)
-                   .group(:site_id)
+    @scope ||= site.build_stats.jekyll.where('created_at >= ?', beginning_of_interval)
   end
 
   # Las opciones por defecto
diff --git a/app/jobs/uri_collection_job.rb b/app/jobs/uri_collection_job.rb
index 620123db..1553fb22 100644
--- a/app/jobs/uri_collection_job.rb
+++ b/app/jobs/uri_collection_job.rb
@@ -52,7 +52,7 @@ class UriCollectionJob < PeriodicJob
         dimensions = { host: host, uri: uri }
 
         rollup(name, beginning, **dimensions)
-        reduce_rollup(name, beginning, **dimensions)
+        reduce_rollup(name, beginning, :sum, **dimensions)
 
         columns.each_pair do |column, values|
           # Obtener orígenes de visitas por host
@@ -62,7 +62,7 @@ class UriCollectionJob < PeriodicJob
             column_dimensions[column] = value
 
             rollup(column_name, beginning, **column_dimensions)
-            reduce_rollup(column_name, beginning, **column_dimensions)
+            reduce_rollup(column_name, beginning, :sum, **column_dimensions)
           end
         end
       end
@@ -75,7 +75,7 @@ class UriCollectionJob < PeriodicJob
                     beginning: beginning)
 
       # Acumular por mes y año
-      reduce_rollup('host', beginning, **host_dimensions)
+      reduce_rollup('host', beginning, :sum, **host_dimensions)
 
       columns.each_key do |column|
         square_rollup(name: "host|uri|#{column}",
@@ -84,7 +84,7 @@ class UriCollectionJob < PeriodicJob
                       dimensions: host_dimensions,
                       beginning: beginning)
 
-        reduce_rollup("host|#{column}", beginning, **host_dimensions)
+        reduce_rollup("host|#{column}", beginning, :sum, **host_dimensions)
       end
     end
 
@@ -110,28 +110,6 @@ class UriCollectionJob < PeriodicJob
              .rollup(name, interval: starting_interval, update: true)
   end
 
-  # Reducir las estadísticas calculadas aplicando un rollup sobre el
-  # intervalo más amplio.
-  #
-  # @param :name [String]
-  # @param :beginning [Time]
-  # @param :dimensions [Hash]
-  # @return [nil]
-  def reduce_rollup(name, beginning, **dimensions)
-    Stat::INTERVALS.reduce do |previous, current|
-      recursive_rollup(name: name,
-                       interval_previous: previous,
-                       interval: current,
-                       dimensions: dimensions,
-                       beginning: beginning)
-
-      # Devolver el intervalo actual
-      current
-    end
-
-    nil
-  end
-
   def stat_name
     STAT_NAME
   end