gpd-925-en/Performance_Optimisation/Assets/Scripts/MassInstantiation.cs

using Unity.Profiling;
using UnityEngine;
using UnityEngine.InputSystem;

namespace DefaultNamespace
{
    public class MassInstantiation : MonoBehaviour
    {
        [SerializeField] private InputActionProperty toggleMassInstantiation;
        [SerializeField] private InputActionProperty deleteAllObjects;
        [SerializeField] private GameObject prefab;
        [SerializeField] private int objectsToInstantiate = 100;
        [SerializeField] private bool isInstantiating;
        
        private static readonly ProfilerMarker InstantiateObjectsMarker = new ProfilerMarker("InstantiateObjects");
        
        private void OnEnable()
        {
            toggleMassInstantiation.action.Enable();
            toggleMassInstantiation.action.performed += _ => isInstantiating = !isInstantiating;
            
            deleteAllObjects.action.Enable();
            deleteAllObjects.action.performed += _ => DeleteAllObjects();
        }

        private void OnDisable()
        {
            toggleMassInstantiation.action.Disable();
            deleteAllObjects.action.Disable();
        }

        private void Update()
        {
            if (isInstantiating) InstantiateObjects();
        }

        private void InstantiateObjects()
        {
            InstantiateObjectsMarker.Begin();
            for (int i = 0; i < objectsToInstantiate; i++)
            {
                Instantiate(prefab, transform);
            }
            InstantiateObjectsMarker.End();
        }

        private void DeleteAllObjects()
        {
            for (int i = transform.childCount - 1; i >= 0; i--)
            {
                Destroy(transform.GetChild(i).gameObject);
            }
        }
    }
}