On what GPU? My experience is that it's faster editing and flicking through images in the develop module with GPU enabled. With it off it's like LR5, takes a couple seconds to load the next flicked through image and of course the slower editing per tool.
That is with a GTX 980. The slow flicking in LR5 even existed on the AMD 290X.
That is with a GTX 980. The slow flicking in LR5 even existed on the AMD 290X.