Object Pooling

.cs

// Object pool.
    Queue<GameObject> objectPool;

objectPool = new Queue<GameObject>();

..

            // Reuse the oldest object in the pool.
            var go = objectPool.Dequeue();
            go.SetActive(false);
            go.transform.position = position;
            if (rotationMode != RotationMode.Keep)
                go.transform.rotation = rotation;
            go.SetActive(true);
            objectPool.Enqueue(go);