Entities

How do I remove entities?
all entities in the world must goes away ( including mob )

this can help you
https://github.com/LegendOfMCPE/ClearLagg

not items but entities ) mob!

this plugin also kills mobs

wait nvm you are right

PHP:

foreach($this->getServer()->getLevels() as $level) {
      foreach($level->getEntities() as $entity) {
        if(!$this->isEntityExempted($entity) && $entity instanceof Creature && !($entity instanceof Human)) {
          $entity->close();
        }
      }
    }

or use this https://github.com/HmHmmHm/EntitiesCleaner