NIS 2012 scans slower than NIS 2011

Hello all,

 

I updated from NIS 2011 to NIS 2012 last week (19.5.0.145).  I have noticed that a full system scan takes approx 20-25 minutes longer than NIS 2011 did.  Both versions were/are set to Full on the scan performance profile and there hasn't been any substantial increase in the number of files on my computer.  I am running Windows 7  Home Premium, SP1, 64 bit.  Only other security software installed in MalwareBytes free version.  Any thoughts/suggestions/help is appreciated.