I have spent the last hour pouring through searches to figure out a similar problem here.
Scenario:
Have a drawing with minimal entities in it, it's ballooned to 3.2m.
Erased all entites/purged (nested too)/saved, dwg is still 3.0m
After some searching came across MP's Counts.lsp, ran it and got this:
Command: (load"counts")
C:COUNTS
Command: counts
Blocks.Count = 3
*Model_Space.Count = 0
*Paper_Space.Count = 0
*Paper_Space0.Count = 0
Dictionaries.Count = 8
Groups.Count = 0
Layouts.Count = 3
ACAD_MLINESTYLE.Count = 1
PlotConfigurations.Count = 0
ACAD_PLOTSTYLENAME.Count = 1
AcDbVariableDictionary.Count = 2
ASE_INDEX_DICTIONARY.Count = 1
DWGPROPS has no <Count> property.
DimStyles.Count = 2
Groups.Count = 0
Layers.Count = 3
Layouts.Count = 3
Linetypes.Count = 3
RegisteredApplications.Count = 2
Modelspace.Count = 0
Paperspace.Count = 0
I know there are still layer filters to delete and all, but I'm not convinced that that is taking up 3meg. The "Dictionaries = 8" in MP's tool is what I'm looking at for now. Does anyone know if I'm on the right track for getting this file down to nothing?