Learning fast--just saying the words in order and going on --is a great piece of advice about learning which really comes straight from the Talmud itself. לעולם לגרוס איניש אע''ג ששוכח ואף על גב שאינו יודע מה שהוא אומר .  and one of the major books of Musar the  אורחות צדיקים brings this path of learning in Shar Hatorah. But they are usually understood to mean learning gemara in this way. However at some point  a few years ago I became aware that learning math and physics is considered as part of the mitzvah to learn Torah and so I applied this path of learning to my studies in Physics at the Polytechnic Institute of NYU.  

So now I try to have both in depth learning sessions with lots of review of every chapter and also fast learning sessions.  [this is very well known in litvak yeshivot where the accepted approach to learning is to do in depth learning in the morning and fast learning in the afternoon.] [however the fast learning is much slower than the approachof just saying the words and going on]