Hi. This is probably of no use, as it seems like you are using jumps to speedrun.

But I have twice glitched the game to have permanent agility spell speed.

First time was falling from the university and dying upon ground impact after casting spell. I respawned with permanent speed. I couldn't replicate this when I later lost the speed after a reload (many hours later).

However, shortly thereafter, I travelled to the Clockwork Kingdom on the ship. During that sequence, the player can look around but not move. I thought to cast agility and the spell froze upon expiring while the ship sailed.

When the ship docked and I regained control, I had permanent speed again. This second approach to the glitch sounds much more reliable.

I figured it could be used in routing perhaps as it massively speeds up transit time.

Also, you may figure out another more consistent way to get the glitch even earlier.