I noticed in the 1.9 opt-in patch and also in the 1.9 official patch that ship movement on the map is very, *very* choppy and slow. Since that was not the case before it can't be my machine (Intel Core i7-4720HQ, 2.6 GHz, 32 GB RAM, NVIDIA GeForce GTX 980M) or operating system (Windows 10 Home).
Although I have to admit I didn't play for a while and so can't say whether it was a previous patch that introduced the problem ...