Checked last night, and I had no issues in all those areas. In fact I took a trip around the whole lake, and looked at Pawnee's tribe etc etc. No issues.
I do see a very slight (20ms) stutter in some areas, but as Wyry says I think it's loading in buildings or something.
I really do not have lag issues, and for some reason my ping is 0ms not sure how that comes out as I don't even have 0ms to my own router in my house.
Maybe it is something to do with my connection but only when playing Xsyon as I don't have this type of issue with any other game I play.
I did notice when running back and forth to founders from 1099 that the lag spots heading south were the same but heading north I hit spots in different places. Any that you get maybe because of buildings but I get them in the middle of nowhere.
Anyway they are an issue (not a game breaking one) for me and my alts as I run around the map but I'm happy that this isn't really affecting anyone else to the same degree.