When doing a regular wall jump, massive air drag is applied to you after you jump from the wall. This heavily impacts speed.

It's possible to override the massive air drag by quickly air jumping afterwards, spending one stamina. This can be easily achieved by rebinding jump to mouse wheel down.

Wall Boosting is best used in conjunction with a Dash Jump, to take advantage of the extra speed and low air drag.

Wall Boosting does spend an air jump, so it is advised to only use it when you aren’t in combat or when you have more Stamina to spend.

To execute, wall jump then quickly air jump.