+++ This bug was initially created as a clone of Bug #1094756 +++

Description of problem:
We have found a performance regression with EAP 6.2.3 CP build. We see ~20% drop of throughput with complex enterprise application (EJB, JPA, JMS, JSP). 

Version-Release number of selected component (if applicable):
EAP 6.2.3.CP.CR2

How reproducible:
Always, we have stable results

Actual results:
We see a performance regression with Daytrader benchmark. Results show ~20% drop on TPS with complex trader scenario (EE application with JMS).

Expected results:
CP release should not introduce any regressions.

Additional info:
EAP 6.2.3 CP release contains upgrades of many components. We have tried to isolate cause of this regression and it looks like that upgrade of Hibernate in EAP 6.2.3 CP causes this regression. We have re-executed performance test with modified build with downgraded Hibernate and we do not see any performance regressions.

--- Additional comment from Brett Meyer on 2014-05-06 10:17:51 EDT ---

Discussing with the team -- most likely due to https://hibernate.atlassian.net/browse/HHH-3051

--- Additional comment from Brett Meyer on 2014-05-06 10:46:29 EDT ---

Pavel, can you confirm that the 20% drop is when compared against 6.2.0 (ORM 4.2.7.SP1)?

--- Additional comment from Martin Simka on 2014-05-06 11:09:43 EDT ---

yes, it's when compared against 6.2.0. We also tried to execute performance test with EAP 6.2.3 and hibernate jars from 6.2.0 and in that case there was no performance regression.