Memory at 52% before I even begin a session...

Hi all,



So all of a sudden when I begin a new session my memory in the system usage window is at or around 52-60%!! This is a huge increase as it was normally around 14-20% before I added any tracks.



Does anyone have any idea why this could be? Or why it decided to jump up that much already? I did just download Addictive Drummer 2 if that means anything...



Any input is appreciated!



Thanks, Joe