Drop: Unlockable skill, press the drop key to drop down. This increases your speed. The tech here is to drop whenever possible, especially before swinging.

A small note about jumping. Jumping adds an impulse to your current speed, no matter what speed you're currently at. Jumping off an (upward) sloped surface increases the speed you gain.

Jumpcancel/Ghosthop: Press jump just before hitting the ground to cancel the landing animation and gain a little bit of speed. Jump again asap to start bunnyhopping. Jumpcancel can be used from any airborne situation.

Metalbarjump(MBJ): Metalbars have a property of being semi solid. This means that you can pass through them from below but they still count as "ground" making them eligible for a jumpcancel. The real difficulty here lies in swinging correctly. If you cancel your swing, or more like pull, towards the metalbar, you don't lose your speed. Adding the jump to it can give you insane speed.

Pullswing: Press the jump button to pull yourself towards the hookpoint. Doing this at the correct time increases the speed you gain from swinging. Usually used with very short swings and horizontal swings.