User blog comment:Adsper/All Possible Mobs/@comment-32337650-20171022031620/@comment-25118285-20171022045353

Think of it this way: You're standing in like a Cretaceous Forest or something. There's only like 8 species that live in this biome. There aren't going to be tons of each species everywhere; that wouldn't make sense. Maybe some small herds of herbivores every once in a while, with the occasional predator and then some microraptor and confucis flying around. I don't think you would have any more lag than you would if you built a nice zoo.