I do appreciate you spending time with me on this. I must be missing something somewhere. I understand the formulas, but I dont get what is happening here.
When I attach my 5MB file in gmail (which is similar to your example of 4 or 5 documents) each one zips from left to right in less than a second. In fact, I can not get to the activity monitor window before its complete.
If I understand this correctly, Mail is sending my email and uploading attachments at the same time.
Gmail seems to upload the attachment first (in a few seconds) then send it off.