Yeah I know a bunch of skips I'm yet to implement for consistency. I'll implement the one at 0:44, should save a second or so. And the skip at 2:00 is neat.
<timestamps according to real time, not ingame time>
at 0:12 you can hack the door before it begins closing, being able to walk through without it first closing and opening.
at 1:45 you can go along the bottom. Alongside the skip at the last part it could save a ton of time since you basically skip any waiting at all in that one.
2:44 obviously I didn't do the skip first time, but that one is very precise and I don't have a setup, effectively random. Needs more testing.
3:00 you can definetly go on top to the left and around, but its quite precise. Could save like a whole minute. (You can get pushed up the first part by the robot)
4:05 there's a skip, you can get on top and jump past the turrets to skip two shooting cycles, but its quite precise. (you need to do it at the top left border)
4:20 going through the middle is faster but risky and has a lot of RNG.
Sub3 is definetly possible, just very hard.