To me it seems you need a combination of learning fast along with deep in depth learning. I did notice that each type has its advantages. But I have also seen that people that do only the fast type tend to not really get the learning at all. On the other hand the slow and in depth type that you see in places like the Mir or Ponovitch tend to lack the broad perspective.
It looks to me that the only way that each type of learning really works well is when there is some kind of balance.
