Hello I am working for an consulting engineering firm where I mark up drawings. There is a long (3-5 mins) pause from when i switch from edit to comments in the toolbar. Sometimes it even crashes.
Working on a 43 pages document, so far i have about 724 comments but it can go up to 3000. I am on Adobe Acrobat Pro DC version 2018.011.20058.
Too bad i cannot attach dump files or submit an issue/problem on the site or send through e-mail.
I found a work around, before switching between tools, save pdf close and reopen then select comment in toolbar (a lot faster).
Well, I decided to give up of Adobe Pro, I am now using Bluebeam Revu Extreme (much more efficient and robust) and I will continue on testing it for my organization.