Low Performance of 7.1.0.CR1b - comparing with previous release

There is low (especially stress test) performance of AS 7.1.0.CR1b. Comparing to 7.1.0.Beta1 there is at least three times worse performance. You can see marked builds at https://hudson.qa.jboss.com/hudson/view/Weld/view/Weld-Performance-All/job/perf-weld-numberguess-stress-single-jboss7/. In artifacts there is the log.txt file, where you can check stress tests results. I have run it quite many times with same or mostly similar results.