Shooting script causing lag (Android build)

Hello , I'm doing my first game , a simple 2D space shooter for mobile, but I'm having problems with the shooting script, unfortunately it is causing a lag and I did not know how to solve , anyone have any idea how can I improve it ?
Some parts of the code are in my native language , if someone can not understand , I can explain their functions in code. Sry for my English.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. public class Atirar02 : MonoBehaviour
6. {
7.     public Stack<GameObject> s = new Stack<GameObject> ();//GameObject Pool
8.     public GameObject Projectile;
9.     public GameObject ExitPoint_1;
10.     public GameObject ExitPoint_2;
11.     private bool CanFire;
12.     public float ProjectileSpeed;
13.     public bool ButtonClick;
14.  
15.     void Awake()
16.     {
17.         for(int i = 0; i < 40; i++)
18.         {
19.             GameObject aux;
20.             aux = (GameObject) Instantiate(Projectile);
21.             Physics2D.IgnoreCollision(this.gameObject.GetComponent<Collider2D>(),
22.                                       aux.gameObject.GetComponent<Collider2D>());
23.             aux.AddComponent<PorNaPool>();//if a collision occurs re-add the object to the pool
24.             aux.SetActive(false);
25.             s.Push(aux);
26.         }
27.     }
28.  
29.     void Start ()
30.     {
31.  
32.         Physics2D.IgnoreCollision(this.gameObject.GetComponent<Collider2D>(),
33.                                   Projectile.gameObject.GetComponent<Collider2D>());
34.         CanFire = true;
35.         ButtonClick = false;
36.     }
37.  
38.     void Delay()
39.     {
40.         CanFire = true;
41.     }
42.    
43.     public void OnAtirar()
44.     {
45.         ButtonClick = true;
46.     }
47.    
48.     public void OffAtirar()
49.     {
50.         ButtonClick = false;
51.     }
52.    
53.     void FixedUpdate ()
54.     {
55.         if ( ButtonClick )
56.         {
57.             if( CanFire )
58.             {
59.                 GameObject aux,aux2;
60.                 aux = s.Pop();
61.                 aux2 = s.Pop();
62.                 aux.SetActive(true);
63.                 aux2.SetActive(true);
64.                 aux.transform.position = ExitPoint_1.transform.position;
65.                 Physics2D.IgnoreCollision(this.gameObject.GetComponent<Collider2D>(),
66.                                           aux.gameObject.GetComponent<Collider2D>());
67.                 aux.GetComponent<Rigidbody2D>().velocity = transform.up * ProjectileSpeed;
68.                 aux2.transform.position = ExitPoint_2.transform.position;
69.                 Physics2D.IgnoreCollision(this.gameObject.GetComponent<Collider2D>(),
70.                                           aux2.gameObject.GetComponent<Collider2D>());
71.                 aux2.GetComponent<Rigidbody2D>().velocity = transform.up * ProjectileSpeed;
72.                 CanFire = false;
73.                 Invoke( "Delay", 0.25f );
74.             }
75.         }
76.     }
77. }

 

GetComponent is slow. Try avoiding that in Update.

 

Also dont use Instantiate. Use Object pooling.

 

Adding another pool to store the rigidbody2d , could increase the speed at updade function? Is there anything that can be improved?