--- /dev/null
+title: Performance regression
+status: OPEN
+reported by: Kim Nguyễn
+last modified: 2012-04-24 09:45:35+0200
+date: 2012-04-24 09:45:35+0200
+author: Kim Nguyễn
+assigned to: Kim Nguyễn
+
+-- opened by Kim Nguyễn on 2012-04-24 09:45:35+0200
+
+Problem description: Significant slowdown in queries Q9 and Q28 w.r.t. older version.
+
+How to reproduce: Run Q9 and Q28 on xmark_10.xml
+
+Proposed solution: Investigate.