Build a massive cow farm? A dark room spawner with 100 zombies? Every entity in singleplayer runs a "think" function 20 times per second. Each zombie pathfinding against every solid block is CPU-heavy. Keep mob caps reasonable.
Depending on which version you are playing, the mechanics differ vastly from modern Minecraft 1.20+. eagler craft singleplayer hot
When users search for "Eaglercraft singleplayer hot," they are usually looking for two things: and functionality . Build a massive cow farm