I haven’t played with many friends in a solo game ( with coop ), but the more you invite , the more your computer will have to work hard to synchronize the world for the others … it can be pretty taxing if you are playing on the same machine , maybe getting up a dedicated server ( or renting one if you don’t feel you can do it ) . you can use the database of your saved game (with your friends , as a starter point for your server for not losing progression ) , this will also help you get rid , of the tethering distance ( everyone will be able to roam the map without limitation and not teleported on you if they go to far , or at each dungeon )
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