My last workout was interesting. It was just one step for half an hour. So while I was riding around Flatland Loop in Makuri everything was fine until the 2min. mark where the arch approached. FPS dropped hard and stayed that way. I could see the arch has been rendered on the connecting street between Neokyo and Makuri because I was approaching that junction.
As I was a bit faster I passed the junction and stayed on Makuri which caused the arch to be replaced on the Makuri road. As soon as this happened my FPS where back to a high value and stayed there until the end of the workout.