Yesterday we was in a group of almost 20 people to make a world tour.
We was riding from Valhalla Atrium all around the world to visit all the points of interest.
We figured out after half of the tour, that everone of us (some a bit earlier, some a bit later) had the same behaviour of the client.
This was the path we did, with some small fighting at the points of interest.
It was around after 1-1,5 hours:
While the Latency and the FPS was stable as they should, the client started to stutter in showing the world itself with each second step we did.
While all animations still was smooth, just the world itself made hickups, like loading new area after 2-3 steps of your horse. It was like you watch a video with one (1) Frame per second or you click through a dia show.
As i said, all other stuff was still smooth, like fighting or running around, when your client didn't load next Area. Also while the world loading was just like 1 FPS the Character animations itself on the horse was showing in normal FPS.
We all did just a logout/login again (not a client restart!), that solved the problem till the memory was filled up again.