Compiling the shaders and baking the first region.
A coarse one comes up first, and sharpens.
Rough here, and said so. A town is rebuilt whole when the camera has moved far enough, and a browser has one thread to do it on — so expect a real hitch rather than the tenth of a second a range costs. The engine has no partial rebuild yet; that is the fault, and it is written down rather than hidden.