Well the game just came out and we had two patches last one to address the save crashes. Haven't experienced any freezing or lagging (feels like my game loads even faster than usual). Only bug im experiencing thus far is furniture poofing.
I'm sure they're compiling any bugs that have arose so they can work on them. :)
Best to report any bugs and troubles you're having at the HQ bug thread and shoot them a save file. Just takes some time. I expect them to make another patch again sometime this month.