How to optimize my - axis Y move script?

Unity Engine
1

Hi.
I need help with optimize my script. This script enable to my obstacles moving in Y axis between 2 values (0, -4,0) and (0, 4, 0). This script using 10 obstacles at the same time. But this script greatly reduces FPS in my Andorid game.
How can i optimize this code ? Thank you

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BarrierScript : MonoBehaviour
{

    float SpeedY = 15;

    void Start()
    {

    }


    void Update()
    {

        transform.position += new Vector3(0f, SpeedY * Time.deltaTime);

            if (transform.position.y >= 5.4f)
            {
            SpeedY *= -1;
            }
            if (transform.position.y <= -5.4f)
            {
            SpeedY *= -1;
            }   
    }
   
}
2

Whatever your performance problem is I can assure you it has Nothing to do with this code. What does your profiler say is the cause?