I cannot play any dungeon without getting stuttering that leads to 5fps. Even with the master volume shut off, it still lags horribly. No issue before endwalker. Only guaranteed fix is hitting the windows key to bring up the start menu and forces the game into the background (switches to window mode). There, the game catches up and the stuttering stops and the fps returns to 60fps. I go back to the game and it's fine until it starts over again.