What if we can have as many dimensions (like adding a 4th dimension: sound(db) or any axis in a <> angle than 90) as we like and any try not to expand the number of dimensions, but to reduce them to two dimensions (like a 0,1).

Since we try to "travel in time" let's try to look at the line between two points, from a point very close to the line. The projection of those two points (to the line form to the projection of this new point to the two points line) gives the line axis for a dimension where you only have to travel a short distance to actually reach the second point.

So in traveling via the other dimension, we can reach faster.