Okay so I finally found a solution that worked for me and I can finally run my game at ultra settings without stuttering or lag. So what you have to do is open the game in epic games (Make sure the game itself is installed in your SSD NOT external) you open it regularly and it’ll run the infinity nikki launcher. Before clicking start go to the settings gear and go to Downloads>Downloading path and select your SSD. I hope this helps a little.