A family of Microsoft word processing software products for creating web, email, and print documents.
Rufine, I know you can't use RTF, but have you tried to copy all to clipboard and paste using merge formatting into a new Word document?
I had similar issues of long save times (opening the document was a bit slow too) and lag when typing also when opening the document it would take some time to count all the pages and be ready to use.
After reading lots of posts on this thread I tried to disable background saves, then I tried WinWord / safe, looked at the add-in COM stuff (chickened out), and even tried disabling all AutoComplete or any spelling or grammar or anything that might try to fix or monitor my document and it still was doggy.
The document was an "rtf" type of file format with about 410 pages and 120,000 words (about 1.6 MB). I admit that this particular document had been worked on and saved (or converted) by different applications (Word, Pages, WordPad, Pages New, Google Docs probably had it for a while too, who knows what else over the years - it was probably started in NotePad and worked on with TextEdit too) (the document is at least 10 years old) on multiple systems of differing OS.
It is now getting fairly complex with tables, web addresses, bulleting and more.
I opened the document in Word 2013 and used the select all command and copied it to the clipboard, then pasted to a newly created Word 2013 document using the merge formatting option and so far everything seems to look great and works great too. I did select some options like spacing between paragraphs in the newly created document before pasting the data to it, so the end result is closer to what I was looking for.
My web address hyperlinks came through as active links even though they were not active in the original document - I guess I could have specified this in the new document before pasting but it doesn't really bother me so it stays that way. The new file is in the docx format and the size fell from 1.6 MB to 328 KB - I could not find any missing information in the new file and was surprised the new file was that much smaller.
So far so good - will see if over time the performance wanes.