Super Mario Bros 2D very lagging

Questions & Answers
1

Hello! I’m creating Super Mario Bros 2D. When I run it with 1 enemy mushroom it runs smoothly. But if enemies are more than 2 it becomes very laggy. Here is mushroom enemy script:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class Mushroom : MonoBehaviour

{

public float speed;
public bool moveLeft = true;
public GameObject camera;
bool colliding;
float collidingTime;

void Start() => Physics2D.IgnoreCollision(camera.GetComponent<BoxCollider2D>(), GetComponent<Collider2D>());

void FixedUpdate()
{
    if (moveLeft && GetComponent<En>().isHit == false)
        transform.Translate(Vector2.left * Time.deltaTime * speed, Space.World);
    else if (!moveLeft && GetComponent<En>**This is Enemy script**().isHit == false)
        transform.Translate(Vector2.right * Time.deltaTime * speed, Space.World);

    if (colliding)
    {
        collidingTime = 0;
    }
    else
    {
        collidingTime += Time.deltaTime;
        if (collidingTime >= 2)
            Destroy(gameObject);
    }
}

private void OnCollisionEnter2D(Collision2D collision)
{
    colliding = true;

    if (!collision.gameObject.CompareTag("Player") && !collision.gameObject.CompareTag("chunk") && !collision.gameObject.CompareTag("gr"))
    {
        if (moveLeft)
            moveLeft = false;
        else
            moveLeft = true;
    }

    if (collision.gameObject.CompareTag("MainCamera"))
        Destroy(gameObject);
}

private void OnCollisionStay2D(Collision2D collision) => colliding = true;

private void OnCollisionExit2D(Collision2D collision) => colliding = false;

private void OnTriggerEnter2D(Collider2D collision)
{
    if (collision.gameObject.CompareTag("Player"))
    {
        collision.gameObject.GetComponent<Rigidbody2D>().AddForce(Vector2.up * 3, ForceMode2D.Impulse);
        GetComponent<PolygonCollider2D>().enabled = false;
        GetComponent<En>().startDeath();
    }
}

}

And enemy script for all enemies:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class En : MonoBehaviour

{

public bool isHit = false;
public Sprite juSp;

private void OnCollisionEnter2D(Collision2D collision)
{
    if (collision.gameObject.tag == "Player" && !isHit)
        collision.gameObject.GetComponent<Mario>().Lo();
}

public IEnumerator Death()
{
    isHit = true;
    GetComponent<Animator>().enabled = false;
    GetComponent<SpriteRenderer>().sprite = juSp;
    if (GetComponent<Rigidbody2D>().bodyType == RigidbodyType2D.Dynamic)
        GetComponent<Rigidbody2D>().bodyType = RigidbodyType2D.Kinematic;
    if (gameObject.CompareTag("mu"))
        GetComponent<Collider2D>().enabled = false;
    yield return new WaitForSeconds(2f);
    Destroy(gameObject);
}

public void startDeath() => StartCoroutine(Death());

}
and I have a script for when player is nearby enemies will be active:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class FPSOptimizer : MonoBehaviour

{

public GameObject player;

public GameObject[] enemy;

void FixedUpdate()

{

    for (int i = 0; i < enemy.Length; i++)

    {

        if (enemy*.transform.position.x - player.transform.position.x <= 3)*

enemy*.SetActive(true);*
}
}
}
Does anyone have idea for optimizing script? There is a lot of things to do. But I stuck there.

2

Declare all the GetComponents in the Start Method as variables then it only has to do it once not every frame, that should make a massive difference.