Do you mean specifically studying literature (in this case the books themselves, and their authors/period etc.) or trying to acquire knowledge from a scientific work?

In any case, I don't think that rushing the process is helpful, it might depends on individual factors.

I used to read very quickly as a teen, a trick to impress friends or to skim through boring books. I did not find it enjoyable, at all.

The nicest part about reading (for me) is the thinking part, when I stop reading and reflect on an interesting/surprising idea, taking the time to write mental or literal notes.