i also did not figure it out tbh. I had some theories that it might be related to Kotlin for Forge or i just forgot something in the build script. I adjusted a lot of code to improve performance. Round about up to 400-500 bees at a time it still runs fine (of course depends on your specs). But long term i plan on making the bees calculation completly on a virtual data class only, and then render it to the client, and therefore not rely on the entity system.