Rotated objects in an open document use more RAM than non-rotated objects. This is especially noticeable when bitmaps or pixmaps are rotated, as these objects use much more RAM than native MacDraw II/Pro objects.
MacDraw stores two images of rotated objects in RAM: a rotated and non-rotated copy of the object. This is done to improve the print quality of rotated objects when printing to print drivers that have their own rotation commands.
When printing to a print driver with built-in rotation, such as the LaserWriter, MacDraw sends a non-rotated version of the rotated object and lets the print driver rotate the object at its maximum resolution. When printing to a print driver without built-in rotation (i.e., ImageWriter), MacDraw sends the rotated bitmap based on 72dpi.