Thank you so much for your comments. knowing that even autodesk's products
have drawbacks boosts my spirit.

notes.
1 I would like to have AutoCAD 2017 on my machine, except due to stark
budgeting decisions, 'veI let my subscription lapse.
2 it would be helpful for me to run AutoCAD 2016--which I assume was a
release. In 2016. my subscription was still in effect part of that year.
3 An earlier commenter suggested I work with a jpeg formatted file instead
of a pdf one. I followed thru on that suggestion, but I see little
performance difference.