Also made an account just to post a thread about it and raise awerness. Having same exact problems as mentioned above but for us it was a bad experience from the get-go, even though it gets worse as we advance through the game.
But even the first half hour felt janky and laggy. And the poor targeting of lootable/interactive items gave a bad feel already in the room where you rescue shadowheart.
But as you all stated, 15-20 hours into the game and its not playable.
