Would you like to solve my problem,how to reduce memory drawing,if we creat a cicle 2D r = 1 memory 164 Kb and changed to 3D with extrude = 1 memory became 35 Kb,then scale 0.1 memory 40 Kb,scale again 0.1 m = 44 Kb,scale 0.1 m = 44 Kb,scale 0.1 m = 48 Kb and last scale 0.1 m = 54 Kb.Why if drawing in 3D with scale decrease position,memory became increase,can you to suggest me to reduce memory at 3D drawing,(in AutoCad R13),thanks you