Slow Viewport in Big Scene I recently am working on a scene in Blender Cycles which has a relatively great number of objects. Some are more detailed and need more subdivide but the small objects are all just subdivided once. 
So the problem is that my blender gets slow when I move the camera in the viewport. 
In 3ds Max you can choose objects that you dont need to look at right now and select "Show them as box", which will let them be displayed as a wireframe box and therefore wont stress the scene that much. 

My question is if there is a function like that in Blender? (exept hiding objects)

And do you have tips on working on bigger scenes in blender too keep it fast? For example I have a lot of chopsticks in my scene. Should I merge them together to 1 object instead of individual objects and then just give them different materials? 

thanks in advance :)
you can change how your object is drawn by changing the "Draw Type" in Properties panel -> object -> display. 

To my experience, less objects you have in your scene better blender run, so it's a good idea to merge them in 1 object.