Scrolling backgrounds cause lag on android

Hello there.

Yesterday I was very happy when I found out how to make Android on screen controls work. After that I realised the game is lagging on Android device (Samsung Galaxy Tab 2). I know it's an old device, but c'mon guys, my game is an endless runner done in pixel art. I remember that I played San Andreas on that device.

Let's get to the topic. I turned off things one by one and I found out that the lag is caused mostly by Scrolling Backgrounds and texture/platform that I run on. There are 4 of them and they are PNG. 3 Backgrounds and one texture. Here is the teaser of my game, you can see all backgrounds and the texture. [MEDIA=youtube]HnFm7Ypw7ec[/MEDIA]

This is the script that I use to scroll them.

[code] using UnityEngine; using System.Collections;

public class ScrollScript : MonoBehaviour { private Material currentMaterial; public float scrollSpeed; private float offset;

 void Start (){

     currentMaterial = GetComponent<Renderer>().material;
 }
  
 // Update is called once per frame
 void FixedUpdate () {
  
     offset += scrollSpeed * Time.deltaTime;
     offset = offset % 1.0f;
     currentMaterial.mainTextureOffset = new Vector2(offset,0);


 }

}

[/code]

Is there anything that I can do to improve their performance ? If you need anything else I can provide you with it.

Thanks in advance !