sorry its not about the pacing, I mean the sudden shift in the focus of the movie feels kinda out of place. In "A new Hope' its focus is always on the death star and how to destroy it. its also just too convience, to do the rescue and take down the shield at the same time.
I think it would have been better that the movie focus solely on the map and the Rey's rescue take place on the mother ship. It may be trap set by Ren so he can capture the rescuers to locate the rebel base. Rey learn about the death star planet(the weapon wasnt completed yet but will be soon) and defeat Ren in similar fashion after Han's death and escape with intel on the death star.