Why are Drawings Huge?

I have a top level assembly that I need a drawing of, three views of three different configurations.  That’s it, no text, no sections/details, no dims, just three views.  Granted, the assembly file is large (57Mb), but what would cause the drawing file to be 54Mb?  I know SW has some issues with file sizes getting ridiculously large, but what would cause a drawing file get so big?

SolidworksDrawings And Detailing