While I was trying to practice the 0g speedrun I saw that wr holder had taken fall damage when he jumped off the rock next to the barrels, and it seemed to slow him down a bit, but when you jump down the left of the mountain and land on these two barrels it will actually push you, perhaps being even quicker than wr

There's a bounce you can also do straight from where I landed to the barrels that propels you in the right direction as well. Just hasn't been done in a run yet

Oh, I also believe during the first repair you hit the pipe losing some amount of time.