Any3-4

The normal exit is required in this level, as the secret exit sends you to Laamp's Shade. This would save around 35 seconds, as the early exit itself saves around 10 and Dizzying Descent can be completed in 5 seconds with the warp. Unfortunately, Laamp requires 15 moons, and beating the required bonuses would lose far more time than it would save.

Optimal

This level features a few quad jumps to travel vertically as fast as possible.
At 0:08.5 a semisolid dropdash is used to immediately accelerate left. If you position the groundpound too high you can just fall back to the ground and dropdash (you will likely get snapped), but if it is too low you need to dropdash up to the platform to recover. It's fine to omit this maneuver if you find it to be inconsistent.
At 0:10.8 aim to land on the rightmost side of the platform. This allows you to piggyback and jump over the bee while maintaining speed, and reach the cartridge platform with a triple jump (basically just a quad jump without the second piggyback). Make sure to slow down enough to not take damage if you land further left. It's also fine to just quad jump up to the higher platform with the Slickos.
After firing out of the cannon at 0:15.5, another semisolid dropdash can be used to immediately land on the platform. You cannot dropdash to the right from the top of the cannon shot as you will end up in the cannon which fires left.
The final section to the goal is tricky so make sure to practice it. Aim to bounce high enough off the penguin to clear the first Slicko, but low enough to go under the Cawbie. It's fine to add in another dropdash over the penguins if you find jumping and bouncing off of them to be inconsistent.

Any time of 22 or better is good on this level.

Early bubble

This video demonstrates the fastest way to get the buddy bubble at the start of the stage if you take damage and lose Marbles at the end of Aucora's Abyss.