I have chosen Rendered display mode.
Using Bongo 2.0, 2017/03/31, and Rhino 5 SR 13, 64 bit (5.13.60913.21349, 13/09/2016)
I tried putting together a minimal project to send to you. But even with a ‘Save small’ I can only get it down to 140Mb. I have deleted most of the parts. However, when I ran the render process again, to make sure that I send you something with the same result, the ‘flickering’ edges did not happen. Now I am even more stumped. All I did was delete some of the blocks