Main.cs

using UnityEngine;
using System.Collections;

public class Main : MonoBehaviour {
    private GameObject prefab;

    public void Update() {
        Debug.Log(Time.frameCount);
        if(Time.frameCount == 5) {
            Load();
            Instantiate();
        }
    }
    private void Load() {
        Debug.Log("loading resource");
        prefab = (GameObject)Resources.Load("obj", typeof(GameObject));
        Debug.Log("done loading resource");
    }
    private void Instantiate() {
        Debug.Log("instantiating prefab");
        GameObject obj = 
                GameObject.Instantiate(
                        prefab, 
                        Vector3.zero, 
                        Quaternion.identity
                ) as GameObject;
        Debug.Log("done instantiating prefab");
    }
}