Now we have:
+-------+ +-------+
|   0   | |   0   |
|   1   | |   1   |
|   2   | |   2   |
|   3   | |   3   |
|   4   | |   4   |
|   5   | |   5   |
+-------+ +-------+
It should be faster:
+-------+ +-------+
|   0   | |   1   |
|   2   | |   3   |
|   4   | |   5   |
|   1   | |   0   |
|   3   | |   2   |
|   5   | |   4   |
+-------+ +-------+