Even though my son Izhak held with learning in depth, still he recognized the importance of Rav Nahman who strongly held with the approach of fast learning ["just say the words in order and go further" אין צריכים בלימוד רק לומר הדברים כסדר וממילא יבין ם "In learning one only needs to ay the words in order and then he will automatically understand and if he does not understand right away, he will eventually understand; and if after all of that, there are still left some things he did not understand, so what? For the greatness of a lot of learning goes above everything else." so one needs a balance, deep learning in the morning and fast learning in the afternoon. This is the compromise that most Litvak yeshivot have arrived at after a few hundred years of experience. he even mentioned in his bookthe importance of being with rav nahman from uman on rosh hashana and rav nahman definitely emphasized the importance of ''girsa''-saying the words in order and going on as mentioned in tractate shabat pg 63. however i have taken the approach that being in israel is mre important than being in uman.