Increased shut-down time after upgrading to OSX ML?

When I was using Lion on my rMBP, the shut down time was especially quick and the screen just switched off within 1 sec upon pressing the button. With ML now, shut down time is in the range of 5-10 secs and there is always a grey screen with a spinning wheel before shutting down.

Did anyone else experience the same? ML feels sluggish to me even with a clean install.

 

Thanks, but how do i know what app is hanging based on the processes list?

Update: It does feel slightly better now as the shut down time is reduced to 2-3 second, but I didn't anything at all