Basically i have a large blockout scene in the viewport (made with Blockout Tools Plugin), - about 6000 boxes (Nanite enabled) plus about 500 translucent boxes (tried to make them opaque, almost similar performance).
And here is how Nanite handles it:
So i’m getting around 25 fps (rtx 2060).
Without Nanite, performance is a little better (40 fps).
View mode is UNLIT (so no lighting).
Also there is a simple landscape on the scene, volumetric fog and sky atmosphere.
Virtual Shadow Maps OFF, Lumen OFF, RTX OFF.
Why so bad performance?