RoomCull

This block adds one single block

When placed it will look in the direction of each of the 6 faces, and up to a range of 64 blocks will look for where it hits a wall, floor or ceiling, and then calculate a 6 sided rectangular prism as the room, and while you are inside the room, no chunks, particles or entities will be rendered outside the room. 

This would allow you to have very laggy machine heavy based partitioned into rooms, where each room you enter does not have its frame rate affected by the remaining rooms