Query performance drop after upgrade from 2.7 to 2.9

Query performance drop after upgrade from 2.7 to 2.9 for specfic queries on University of Oxford database.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.9.1001.93
 2.91.1535, patch 76 ; 2.9.1001, patch 115 ; 2.93.2034, patch 32 ; 2.94.1524, patch 13

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