So, on my laptop I've been trying to run the game with primusrun so I could make full use of my nVidia graphics card, but for whatever reason, if I do that, the game runs really poorly. I get the same framerate as when I ran it without primusrun, that is using the integrated Intel graphics card.

However, running Duskers with optirun instead of primusrun seems to work just fine. I don't know whether this is a quirk specific to my laptop or a general issue, but I wanted to let everyone know anyway.