Why are my DXFs file sizes massive?

We've noticed that our DXF exports from solidworks are absolutely massive at work. I've exported a completely blank drawing and it's almost 90MB. This all seems to come from a cluster of points of the OLE layer just outside the drawing border.

 

If I delete these and resave from Draftsight it's 88KB. Has anyone had this issue and have a fixdxffile sze