I also got a significant speedup after the rewire (without looking at the prompt.) OTOH, I was consciously visualizing the mirrored position of the target circ

I also got a significant speedup after the rewire (without looking at the prompt.) OTOH, I was consciously visualizing the mirrored position of the target circle on screen and navigating toward that without looking at the mouse cursor, so mentally it's exactly the same movement as the pre-rewire step.