ACAD increasing file sizes from one release to another

I have been revising some older blocks dating back to 2003 and earlier.  What was a file size of 28KB increased to 127KB!  In most cases the only change was converting text to an attribute.  As a test I took a 2004 file and saved it - with no changes - to another name and the file size increased from 28KB to 124KB!!!  That's an increase of over 4.4 times!  Many of my 1998 - 2006 files are in the 26KB - 40KB range.

That's a bit much of an increase over several ACAD versions!  Is there a way to reduce the file size?  I did perform a complete Purge before saving.  Have I missed some clever trick?

I am running ACAD Version 2014 with SP-1.

Just wondering.

R

Image may be NSFW.
Clik here to view.Image may be NSFW.
Clik here to view.Image may be NSFW.
Clik here to view.Image may be NSFW.
Clik here to view.Image may be NSFW.
Clik here to view.

Image may be NSFW.
Clik here to view.