I think this Gears strat is fastest:

Go to the left first, grab Double Jump. Start combo from other side, only finisher has to hit the gears. Grab Air Slide gear, turn around and get gear in the pit. On the way up, Double Jump and Air Slide to get to the next Gear, faster than walking.

For bosses:

You can use magic and get multiple magic finishers at once, potentially, you can get Thunder, Fire and Blizzard finishers and do a ton of damage at once to bosses.

You can also skip Blizzard during the Aqua Clones. She laughs right before she appears, you can use Thunder to stagger and interupt this cast, saves a ton of time if you get bad RNG. Shout outs to Barbaracle to noticing that one.

Thank you for the tip!

It's faster to do spellweaver before air slide. If you have doubleflight, you can jump directly to the air slide gear from down there.