Madmole: (colored, for his pleasure)
Have y'all considered making low-res versions of your zombies and using THOSE for the horde nights? No one is looking to enjoy the details on blood moons, so basically take one of your 4k PBR versions, lower it to like 512 and cheap (so it's recognizable but not very pretty close up) and use those for your day 7 spawn groups?
I should probably add, the point would be to allow for more zombies on the screen when it counts. I was rocking a 980ti and would drop to 8fps on horde nights and I didn't have everything turned on, so I bumped up to a 2080 today and will test horde nights soon, but I only saw a 20fps increase on a side by side test.