Usually I'm fine, but I do sometimes have issues when using lodestones where the cities take ages to spawn/let me move. I do play on Ultra though and some of my components are getting a little dated (to be changed shortly though!)
Some lodestones I have the same problem, mostly the lumby and buthrope ones are where I notice it. It seems like I'm all loaded and my character is ready to go, but then he just doesn't move for a bit and it has to catch up. Not a problem at most lodestones, but I use the burthrope one so often it's very noticeable.
At first NXT was a bit iffy for me, but at the moment it's far better than JAVA was. But I will love NXT forever because the world map actually loads smoothly. In JAVA the world map always took 5+ second to load and it was laggy.
The only funny problem I've had with NXT recently is if I close out the world map and move too quickly my character gets stuck in a weird way. If I use surge or backstep then all of a sudden my character will teleport to the last place I tried to move to.