Artboard background color degrading 3D image quality

I am adding Artboard background color after i have my 3D image on the artboard. when doing do, the 3D image then appears to degrade in quality, meaning it seems more pixulated and lines are not as smooth as when i did not have a background. I tried rendering the image, but it did not help much. 

Is this normal? Is their anything I can do to prevent this from happening?