Cubic chunks

A Minecraft chunk should rather be a 16-block tall 16x16 segment of a world, instead of 384-block tall 16x16 segment as it is right now. This could be done to significantly improve performance, and players still don't need to render the entire world beneath and above them, since they will not need to see it, and if they need to, they should just crank up their render distance. With this idea inplemented, the FPS for everyone would skyrocket, and low performance even on good PC components would not be such a large issue as it is right now, which, am I have to say, so many people are not pleased about.