I waited a week for Microsoft to fix any potential lag issues the game has, but it would seem they're unable to do so, at least anytime soon. I got fed up with constantly having 3 fps on the ship, so I uninstalled the game (which involved resetting permissions on the folders and very tediously deleting folders in a very specific order)
Then I downloaded the tweaker. Then downloaded the entire game, and proceeded to follow their basic instructions. Game worked first try, and there's almost no lag on the ship. I was also able to join urgent quest groups without being mysteriously dropped from the group and getting softlocked on the quest counter, forcing me to relog. I'm curious if it resolves other random crash issues as well, like when I tried to load into the Urgent quest boss with the hands.
I highly recommend those who installed via Microsoft to uninstall (if you know how) and install the tweaker.