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--- a/Allura/allura/model/artifact.py
+++ b/Allura/allura/model/artifact.py
@@ -562,7 +562,9 @@
         name = 'artifact_feed'
         indexes = [
             'pubdate',
-            ('artifact_ref.project_id', 'artifact_ref.mount_point') ]
+            ('artifact_ref.project_id', 'artifact_ref.mount_point'),
+            (('ref_id', pymongo.ASCENDING),
+             ('pubdate', pymongo.DESCENDING))]
 
     _id = FieldProperty(S.ObjectId)
     ref_id = ForeignIdProperty('ArtifactReference')