I beg to differ. I am using zoned terrains stitched together using third party tools. The way I do it is a bit complicated, but I have not had an issue yet, I spent about a year figuring this out. With my current map I have 64 zones. This is only for testing purposes for me to write my code and do my tests. As the players walk around the world the terrain far off loads (a hard coded limit I set). This is the only way to pull this off. I am certainly not saying that it takes 1 hour to cross my world at all, I am saying I have a highly detailed terrain that may take as of now around 5-6 minutes to cross by walking. This is small really, but I have allowed my code to expand later. This map I am making is only for testing.