I have tried to play without it, and I am 94 hours into the game, so do not want to go backwards, my new gaming computer should be able to handle the game, and I have all the settings on ultra and it runs smoothly until I jump, or go into combat. I am having the same issue, my glitch occured when I was in the Emerald Graves fighting the dragon, and I flew over the cliff. I haven't found anyone with the same problem (the closest was the super jump glitch). I've checked other saves and the same thing happens, and I've just started a new character, and everything was fine, but then I got to level9, in the Storm Coast and while jumping down a rock to fight a bear the problem appeared, and there's nothing I can (or know how to) do that will fix it (I even tried loading an old save to check if the problem was related to some object I'd picked, but no such luck). While fighting (which means either from my first atack or immediately after the character notices an enemy) the character strides really quickly, just like it moves during jumps (which means that if I'm caught by surprise, sometimes my character falls off cliffs and dies).
bouncing off a cliff in the Stom Coast and falling in the middle of the sea, miles from the coast).
While jumping (which includes falling) they move really quickly and travel long distances, and if they bounce off a surface, there is no way I can control their direction (e.g. So, just after I got The Descent, my character started glitching during jumps or fights (only the inquisitor).