Is it faster or the same if it's a ramp and walls, or ramps and adjacent ramps? I don't think i ever tried ramps plus walls
its not faster at all, infact you can't build up speed stationary, only while moving
jumping off a ramp backwards will produce the highest speed in the direction of the ramp, future jumps in that direction will build more speed, but only up to a certain point, once you cross a certain threshold you get a boost of faster speed but your jump will reset denoted by the fact that you make a full jump instead of a partial jump, at which point you no longer have conserved speed. while you have ramp speed held if you jump in any direction other than the direction of the ramp you started it from you will make partial jumps and conserve the speed, you can effectively move with increased speed in one direction forever granted that once you begin to move too fast you make a jump in the opposite direction to slow down and keep the speed. ramps that are super steep like trees can't have speed conserved on them because they give so much speed that you cross that threshold and lose your jump speed after the second jump (the first jump being the one you used to slide of the tree ramp)