I am working on a game that introduces a Jbullet Character_object every certain amount of time into the physics world. The physics world only contain Static_Objects besides the character objects being introduced. Here are the two game states.

Stable state - I introduce only one Character_object into the system every 10 seconds , the game does not slow down the frames per second at all.

Unstable system - Enter a Character_object every three seconds. The games becomes slow and the FPS slow down  from 60 FPS  to 8 FPS. The system never recovers again.

The desired system is to be able to enter into the physics world a character_object every three seconds. Is there any way to enter into the world a character_object that does not introduce any force at all while the velocity of the object falls to a certain threshold ?



Here are the constructors for the Character_Object and the Static_object :

   public Character(String name, String filepath,Vector3 pos) {

      
      //Get box dimensions from libgdx
      Vector3 boxDims = box.getDimensions();
      
      //Character shape, so construct the half extents and convert to JBullet's Vector type
      Vector3f halfExtents = new Vector3f(boxDims.x/2,
                                 boxDims.y/2,
                                 boxDims.z/2);
      CylinderShape shape = new CylinderShape(halfExtents);
      
      rigidBody = Physics.constructRigidBody(shape,
                                             1,
                                             pos.x,
                                             pos.y,
      rigidBody.setFriction(0.6f);
                // Just bouncy
      rigidBody.setRestitution(0.5f);
      rigidBody.setDamping(0.10f,0.80f);   
      
      rigidBody.setCollisionShape(shape);
      rigidBody.setCollisionFlags( rigidBody.getCollisionFlags() | CollisionFlags.CHARACTER_OBJECT);
      
      
   }


public StaticMeshObject(String name, String filepath,Vector3 pos) {
      
   
      
      meshInterface = new TriangleIndexVertexArray();      
      
      trimesh = new IndexedMesh();
   
      
      meshInterface.addIndexedMesh(trimesh);
      BvhTriangleMeshShape meshShape = new BvhTriangleMeshShape(meshInterface, true, true)
      rigidBody = Physics.constructRigidBody(meshShape,
                                 0,
                                 pos.x,
                                 pos.y,
                                 pos.z);
   
      
      rigidBody.setCollisionFlags(rigidBody.getCollisionFlags() | CollisionFlags.STATIC_OBJECT);
   
      
      
   }