Like a lot of other simmers here, I think Hidden Springs is a beautiful world, but to me it is a bit overpriced...
I've never had a legacy played in that hood yet, so I really can't say much about the lag of it but if there's routing issues in it then there will most likely be a lag there. I own all of the Sims Store worlds and I have to say the only one I feel that was worth buying is Lunar Lakes because it is so different than any other world. But that's just my opinion of course.
If you do buy Hidden Springs, I hope you enjoy it because it really is pretty and I enjoy the big spa that comes with it... looks great with Town Life Rabbitholes.
:hugs:
Jase~