if you're currently working on a video game, take a short break, pick a number in your code or data files, multiply it by 1000, and post the results. I would like to see it here in my comments too, thanks!
1000 was not possible on my laptop, but I really tried. 100 with mostly 0 frames and this video version was possible only with max 50 on my RTX1660ti in the unity editor. 70 without the fur renderer. But I did not want to change a particle FX or something to 1000.
I changed this project today to Unity6 Preview and after some little adjustments everything work fine. Thanks to the Unity3D Team!
Found at X from TylerGlaiel, thanks for the idea