What are your computer specs?
(Even when "potato" preset is selected you can still lower texture resolution.)
Honestly that doesn't sound to bad for such a graphics card :D
I probably should make the game run using Forward rendering, since for some reason I set it to deferred (forward - better performance when no/low amount of realtime lights).
Another thing that's still possible to optimize would be body counts (make an option to decrease it or increase it).