I also found Bruce’s training videos on the subject, despite the videos knocking on the door of being a decade old, to be very useful.
I was delighted to have a recent opportunity to practise my own skills in this area, following Bruce’s lead!
The end user was experiencing delays of between several seconds and about half a minute when saving comments in a Word document. Choosing to Insert the comment was fine and when typing the comment, Word also behaved normally. Press Save, however, and Word’s UI would hang for somewhere between a few and 30 seconds.
Yep, sometimes half a minute for each comment being saved!
In a document that required a lot of comments, this was dramatically slowing the user’s work.