My post was at the bottom of the thread I referred to – but it’s been deleted!
So I’ve created a new thread: CSV Importing stopped working after upgrading v 3.0.5 to 3.1.1
On the contrary, we’re finding it blindingly fast.
Because it doesn’t load any records.
Details in other thread (I can’t link to it for some reason)
Thread title: “Please Help Out with Error: Something went wrong.”