Creating mincraft landscape

i am working on min craft look game for android tablet . and i have created the min craft landscape using Cubes library(Block world). But when i try to run the landscape on a tablet. it gets busy or stack since the landscape is very wide, its hard to render the whole landscape boxes. so i have been wondering how can i make it to render only those blocks that are small distance to the player character or camera. so that it wont stack or busy when i run on a tablet. i used height map to create the landscape