I’m very new to LB, but I just looked on the cut settings editor page and saw that you can choose to fill all objects at one, fill by groups or fill shapes individually. If you are only doing lines, I don’t see that option. If you are filling, though, you can choose.
Are you sure about that? If the objects are spaced out, and the machine accelerates fast, then yes, it’ll take less time to engrave them individually.
When they’re close together (as yours are) or if your acceleration is lower (less applicable here) then the machine spends less time slowing down and speeding up, and more time actually engraving. Running the shapes as groups or individuals often takes longer, though that’s not counter-intuitive for most people.