I have a tip for following lectures (or any technical talk, really) that I've been meaning to write about for a while. As you follow along with the speaker, try to predict what they will say next. These can be either local or global predictions. Guess what they will write next, or what will be on the next slide. With some practice (and exposure to the subject area) you can usually get it right. Also try to keep track…
Which is why I hate the PowerPoint presentation-based lectures. Speaker typically goes too fast, and their brain does not actually break down the arguments into logical steps. They just read the slides. Chalk and board is the way.
I found that they can also be combined well by showing a slide that gives some guidance where "we" are in the material, supplemented by writing and drawing on the blackboard to explain one or more bullet points or statements from the slides, and to answer student questions.
This also forces students to take additional notes, which helps them per muscle memory.