Slow scanning NIS 2012

NIS2011 vs 2012
There must be something seriously wrong with NIS2012. I read that 2012 is faster than 2011. Therefore I wrote down the results and first scanned  with 2011 fast and full system scan.

Scan time results
NIS2011
Fast scan 7077 files was 17-18 seconds.
Full system scan
After 10 minutes 575,000 files
Ready after 21 minutes 1,081,466 Files

NIS2012
Fast scan 9896 files 1:25 minutes is 85 seconds
After 10 minutes 274,000 files
Ready after 31 minutes and 40 seconds 1,091,575 files.

 

What is wrong, what can I do?