Morris Proctor suggests we can keep some sections of our Passage Guide collapsed for speed, if we just want to see certain sections this time. At least I think that's where I heard that suggestion.
However, it appears that Logos goes ahead and does the work to populate those sections even if they are collapsed. This sort of defeats the purpose of collapsing them, other than temporarily removing the visual clutter:

Notice above that Interesting Words is still thinking too. As you can see by the black text without the "thinking" bars, some of the other sections completed their work before I saw anything show up in Interesting Words. In this particular instance, that section was all I was interested in, and I wanted to see it fast.
I suggest that you don't even start populating any collapsed sections of the PG until all the expanded sections are populated. Then you can go ahead and work on populating the rest of the sections during idle time so that if the user expands one or more of them, that operating can be really fast.