Its just like avatar culling but for physbones. This is useful for people who have a lot of ram (32GB) but have a low end CPU (any i5 that's xx4000f or non f. also old ryzen3-5). You usually don't see a lot of the physbones on Avis since some people are behind you or thru a wall, and sometimes your in a big event but you just want to have some peoples physbones on since if you have every bodies on it would crash the game. I personally lag way to much before my ram is fully filled up because of the physbones so this feature would help improve performance in big lobbies.