The name of the GRA is associated with learning in depth. However there is an aspect of the Gra that implies learning fast. That is saying the words in order and going on without any review until one finishes the whole book. This is implied when he stressed the importance of getting through at least once the whole two Talmuds, Tosefta, Sifrei Sifra, Midrash Rabah, Midrash Tanchuma (I.E. all the oral law from the redaction of the Mishna until the sealing of the two Talmuds.) [this fast learning is brought in the gemara in shabat and tractate avoda zara, in the musar book ways of the rightous and in the conversations of rav nachman chapter 76 ]
This later fast approach is generally known to come from the Talmud itself in Shabat page 63 and the musar book The Ways Of The Righteous .
I used the approach of ''saying the words in order and going on'' in Torah learning and also in physics and mathematics; saying the words in order and going on until the end of the book and then review from the beginning --and I learnt a lot more than if I had said ''This is too hard for me'' and given up. But in Torah, Math, and Physics it is best if one can hear and learn from a teacher. No matter how much I might have learned in Southern California, there is no question that i would not have understood a thing unless I had gone to those two great NY yeshivot, Shar Yahuv and the Mir and learned from people like Reb Shmuel Berenbaum who really knew the depths of Torah. My only complaint is that I never got the how to get into the depths of Tosphot that Naftali Yeger had in Shar Yashuv and David Bronson. I suspect that it is not something that one can get unless he has that special kind of I.Q. and talent. But at least, the books of the gedolai Lita [Lithuanian Sages] are around so that one can get a taste of authentic learning.
[note: I am aware that some people just don't appreciate learning Torah. taste. Maybe to appreciate it one needs a certain kind of taste. But it might be like many good things--it is an acquired taste. ]
I do not have the IQ of Rav Naftali Yeger or David Bronson, so i do not see automatically the depths of Tosphot. However i have learned a method for at least begin to see those depths. that method is to review that same exact tosphot every day [once per day] for a month,