o/ The trick in the video is quite easy to reproduce and you'll get a ~35% movement speed increase when using a mount. That is to say when having 90 base movement you'll be able to get to 120-125 movement speed, and the greater your movement speed is, the faster your speed will be using the trick.

Still, there's a thing, this trick only works when you move diagonally. The trick works way better while being in the air so you will need a decent amount of jump for it to be useful (At least 10 should be fine).
So what you got to do is to stay in the air while you press A and D alternatively at high speed ( No need to go as fast as possible tho). And that's pretty much all of it :D Enjoy the long jumps !

o/ IGN : Sinon_06