Two significant performance issues have been identified and fixed with APAR IC70269.  
These performance issues only affect version 6.1.4.0, so it is strongly recommended that you use 6.1.4.1 instead of 6.1.4.0.

For additional information please see APAR IC70269:  
http://www.ibm.com/support/docview.wss?uid=swg1IC70269