Determine mb usage of actors and game overhead

Portyman

i have a game created and I use small pictures, but when it I'd running its over 40 mb of usage. I cant figure out why it's so high. Is there any way you can determine the mb cost of an actor? Any one have suggestions in what might cause that image number to be so high for a non graphic intense game? I did delete some actors and reduced he 40 mb down, but the weird thing is that they were no image having actors.. Any helpmwould be appreciated .