Near the end, after flying and once you come out of tunnel, there’s a shortcut through grass and a jump to the right. Cuts out quite a bit. I can’t do it without mushroom. If you can boost over grass and do it then you can use mushroom to cut through grass on final bend.
But you just fall off or bang into the side or get stuck on some grass then you just get annoyed cos it looks easy enough but you can’t do it and every time you retry you press the button at the wrong time and blow up at the start and then have to restart again and you get a good first lap in only to fucking fall off on the second lap. Fuckit.