Yeah, unplayable above pop 650 for me. So I stick with 650 now. I’m pretty sure Crate will adress this issue in the next patches. I hope we don’t have to wait too long though as late game testing is hard with this problem and it takes away a lot of fun, even before 650 villagers (or less with worse systems than mine).
I think they already adressed it in this post, so hope is high: The State of Early Access - Update #01