Highlighting. I used to be so opposed to marking in any book that I took notes as I read. Every single time I took a note I had to figure out where I was before I stopped -- then I had to to get back into the flow. It turns out that getting back into the flow is difficult for me.
So, now I read with the aim of pushing myself quickly and highlighting important parts and details I don't want to get immersed in. If I am doing well that day I might make a table of contents of my highlighted sections afterwards -- page number and minimal notes. If I am doing REALLY well I finish the book then reread the highlighted sections and take notes from that.
My learning style might differ from yours. But I get more mileage from getting an over view first even if shallow. I think notes and mindmaps would result in a deeper level of retention on a single pass but I don't think I personally would ever finish anything that way.
Although I prefer print, if I am reading something digital (even PDF) I cut and paste to a basic text document and keep moving. Do the editing when you are done with the session.
In both cases a review of the highlights or notes are needed to regain the context I had before the break.
For what it's worth, I use context-maps rather than mind-maps, but only after I have a good overview and I am ready to pull it all together.