in my case, I already use layers to reduce the drawcalls. but thats not enough. there are different sprites for each box and in every background box are 2 different fonts o.O
So does it make sense to “group” the boxes without textures to one layer, the all-different-texture-boxes to another layer and for each text-box-font a layer (2 diff. fonts = 2 layers)?
oh by the way… texture in a box… I’ve “played” a bit with the settings, is there no setting to “repeat” a texture?
Also if I try to “stretch” a texture, f.e. a 1x1 pixel or 10x10 (one color) to fit to the whole box-node?
//EDIT:
I’ve did it like said above and decreased the drawcalls from 92 to 31 o.O. Now this GUI takes about 10 drawcalls.
Reduced round about 100 drawcalls now! wow. Knowledge is power! 
thanks again 
@britzl you’re doing a great job to help devs here! applause