Dang.I still dont understand how this games very simple graphics can lag even on this.
The problem with sandbox games is that the CPU has to render
every single block that is within you're field of view.
For example, let's say you have a wall of blocks and behind that wall you have another block. When you look a the wall, you can't see the block behind the wall, but your CPU still renders it since it's within your field of vision.
Minecraft does a better job of fixing this issue, but still isn't perfect.