We must not have been playing the same BF1. Beta and Vanilla had 140+FPS on high settings @ 2560x1440, after the first expansion my FPS would barely hit 60fps on the same setup but with everything set to low and dropping down to 1920x1080, many others had this issue as well. Optimization went out the window for this game the longer in it's life it went. The last expansion I was pushing 20-30fps on the new maps.
One of the reasons I do not have high hopes for this newest variant. I will see what they have to offer but more than likely it will be a re-skin of BF1 in which case it will be a buy on sale item.