Here, we're reading a text file for coordinate data. We'll want to generate meshes and render them. (or use prefabs)
Is there a way to instantiate and render as we read along? Rather than read everything and then render everything? So, we get a sort of "popping" effect.
Although I haven't used them, I'm guessing this is a coroutine deal where the reading is held up while the render is done?
Unless you have a massive amount of data or your code is bad, it would only take a fraction of a second anyway, so it's unlikely you need to worry about it.