Why is my frame rate only 30fps?

u killer a lot of slime kings in my ''lighthouse farm'' but it still drops only 1 legendary gem, the lighthouse doesn't apply to bosses?

Why it always point to the right? Any way to just stay where I aim at?

It says that I still haven't get the achievement of completing all the collections in the museum but I already did it, so I don't know if it is a bug, error, or if there is actually something I need to do

I just cannot build, I have all resourses, space for building, and I dont stand on it. What I can do?