oh, I was assuming that the time for the rotations was dependent on the size of the models, presumably in number of verts. This memoization would change the run

oh, I was assuming that the time for the rotations was dependent on the size of the models, presumably in number of verts. This memoization would change the runtime. E.g. if it was linear in that, then you would be going from O(mn) to O(m+n)