Word processing has been a bit challenging. The text is now some 370,000 words; at this length Microsoft Word becomes a little clunky. Functionalities like spell checking cease to work.
At the suggestion of the Microsoft helpdesk, and with their assistance, I upgraded from Office 32 bit to Office 64-bit yesterday evening. They say that this will increase the muscle power of the program.
We will see.
Another issue is that Dragon software, which I use a fair bit in my practice these days, is very much less than happy with very large documents.