AIController using a lot of performanse

I spawned 24 characters with my controller and the fps is at ~30, i remove dthe behavior tree and even deleted Everything, scripts in the characters,behavior three and AIController and it still around 30. Ok so i set it to the default AIController still the same and only after setting it to none did i get 60 fps.
How to reduce the performance impact of using an aicontroller?

Update Started a new project and migrated my assets and now it works normally…