Here is my situation: 
I have a quite complex game with dozens of layouts. 
The project window size 2048*1152. 
It turned out that the game is too heavy for low-end mobile devices at this size. 
I want to scale sown the entire project to 1024*576 , so I can create a specific build for these devices, and I have a couple of questions regarding this:
1.  In order to make the game lighter, is it enough to scale down the sprites within the game, or do i have to recreate and reload to c2 all my assets scaled to half size?
2.Is there a way to scale down all the layouts at one go? (that would save me many hours of work....)