I have no idea whether this trick will be useful in terms of speed but it is fun to look at!

If you jump onto a launchpad and you hit the Launch Button (X on Switch) as soon as it appears, but before you touch the ground, Sophia will halt in mid-air and go through the launch process from her current position. You can float about 1 Sophia high if you time it early enough!

I discovered this in the following clip: