Speeding up VBA code for adding fields to Word Document. Maybe using Virtual Offscreen Objects?

Question

Is there a way to prepare a virtual object in Word using vba? I am trying to speed up adding about 20000+ Document Variables into the body of a document using the Fields.Add method.

Selection.Fields.Add Range:=Selection.Range, _
                     Type:=wdFieldEmpty, _
                     Text:="DOCVARIABLE " & DocVar.Name & " ", _
                     PreserveFormatting:=True

I'm thinking that adding them to some sort of "virtual paragraph" instead, and appending the document with this "virtual paragraph" right at the end might speed things up.

Additional explanation and testing: (for those that love reading)

Adding 1000 DOCVARIABLE fields to the end of my document takes about 14 seconds with Application.Visible = False. This time seems to go up exponentially the more variables I try to add. I haven't been able to add 20000 Variables yet. With Application.Visibility off, I don't know if the program has crashed or not but 20mins seems too short. This isn't even getting into adding the variables into tables and applying the sorting algorithms I want to apply after that. I would also like the Application.Visibility to be on so that I can display progress of processing in the status bar. But visibilty more than tripples my processing time.

1000 DocVars = 14s
2000 DocVars = 35s
3000 DocVars = 70s
4000 DocVars = 101s
...
20000 will be unusably slow

Thanks

Lance