I have created big size world in world editor and running my example.

Control mesh in big size world, while streaming world 0,2 sec freeze and normal continius.

The freeze is probably loading data (new areas of the world as you move)
Later I'll add caching the areas (load them in the background) so the freezes will not be visible

yea i noticed this also, in a map i made with lots of trees and grass!
but that may be more the fact that it had to update about a million leafes and grass areas