Here is a playlist of the track routes I use on the different tracks to get the fastest times. If you have a better track route, just post them.

https://www.youtube.com/playlist?list=PLUd4MUwOTOH1dQpkRcC7L4ye8OqkC4Mn5

Thanks for posting this, been trying for sub 1 hour and this will definitely help, haven't looked to much into fastest routes myself, but I'll let you know if I find anything :)

That's good. Just remember that they might be harder to pull off against CPUs because they might use items or bump into you, but you can also practice them on arcade mode :) Hope it will help :)