Onecraft is a special type of texture pack. As you all might know, high res texturepacks make the game require more power. A lower res on your texture pack makes the game look a bit worse, but increases performance.
This texture pack has the lowest resolution possible, 1×1. This means that every block is 1×1 pixel big. This is very small and requires less from your PC than a 16×16 pack.
Hope you enjoy it!
http://www.files.9minecraft.net/index.php?act=dl&id=1415177679 (Server US1 – 1.5MB)
http://www.dl6.9minecraft.net/index.php?act=dl&id=1415193273 (Server US2 – 1.5MB)