Many thanks to @Bellwether for discovering the initial glitch. I have found a way to consistently abuse it in other areas of the game:

Sewers:

Ruins:

Rave:

Probably the biggest skip is the rave skip I would say, but they all net you a decent time save.

The main idea is that you do a roll "past the switch" and then turn as you grab the switch.

I believe what is happening is that the game has updated the direction that the character is facing but since it canceled the turning animation with a switching animation it entered a state of "negative acceleration" during the switch animation.

When the player comes out of the switch animation it is facing one direction but built up speed in the opposing direction which causes it to move backwards.

Since its moving backwards it does not check for collision on walls (because it thinks it only has to check in the direction you are facing - not moving) and this can put you through walls.

At least that's my theory.

The glitch is relatively easy to perform but you only get one shot, since after pressing the switch it can't be activated again until you respawn. If hitting these glitches becomes optimal (which I think it will) then you may see yourself resetting on them a few times, unless you're happy to take a death/respawn, which I think will probably negate any benefit of the skip itself.

The only one that is slightly tricky is the sewer one, as I found you needed to be completely in the next screen BEFORE you press the opposite direction to turn. If you began turning on the screen before, even though it cancels the animation you don't get the speed build up for some reason. Given the switch is pretty close to the entrance point, you only have a small window to get it right.

I did try to make the one that @Bellwether originally found work by approaching it from the opposite angle. Unfortunately, while it did trigger the speed increase .. it only worked for a short distance and then cancelled out. I believe the important factor is to get yourself into a wall using it, and the wall in that direction is on the other side of the screen. You just don't make it across.

That's all I could find for this one. Still plenty of other possibilities, not to mention the OOB I accidentally did on my first casual playthrough. Plenty more to discover I'm betting.

This is A M A Z I N G. Thank you so much for putting in the work of figuring this glitch out!

So .. update to this:

While the skips do work .. I didn't realise that the room sequences are actually RNG and come in different orders in different playthroughs.

This means for example, in the above rave skip .. you might get the rave skip if the rave is in the next room .. but you might something completely different ... a lot of the time the next room is just one of the regular rooms for which u will port you into it.

On the ruins skip, I got a sequence that caused me to launch inside a wall in the next room and zip to the top / oob. Unfortunately that yielded no useable results as running to the next room caused me to fall to my death.

The only one that is 100% consistent is the sewers skip, as you are still technically in the same room after performing it.

So ... getting the perfect skips could be a matter of farming for the perfect level layout .. Theres also the possibility that other combinations of level sequences can give even better results. I think I will be blind trying them once every run.