It is not a question of speed, just a change in position. The intersection of two lines is a dot, the intersection of two separate planes is a line, having two separate planes indicates the existence of three-dimensional space, 3D or R3. This could also be stated that the intersection of two subspaces of R3 is a line. Extrapolating to higher dimensions the intersection of two subspaces of R4 is a plane, that is the intersection of two 3D spaces is a plane. Extrapolating still further to arrive at a result of intersection as a 3D space we would need to have the intersection of two subspaces of R5, or in other words, the intersection of two four-dimensional spaces is a 3D space. That we live in a 3D world implies that the minimum configuration of reality is R5. If you extrapolate the relationship between subspaces and the overarching Rn spaces, Rn space touches each subspace at all points. To travel between two points in a 3D space we would need to calculate the vector connecting the coordinates of the 3D space from some point of origin, along with the modifying coordinates associated with 4D space that touches each of the three dimensional spaces. There are two ways to visualize the vector. You can look at it as an external value as an added dimension, sort of like a shell surrounding a shell. Alternatively you could visualize it as a single 4D coordinate point on the 3D space that you must align to the aim point of the 3D destination point. The angle of view is all important for this alignment. As you can shift your angle of view infinitesimally, but there is only one point of view, one angle from your present 3D position where the two 4D coordinates align, to allow the vector to intersect both three dimensional coordinates. As 4D space touches every 3D position simultaneously travel in an R5 subspace would not incur any significant cost in time. There would merely be a near simultaneous change in position. Could time actually then be thought of as even independent of R5?