Help to stump basic touch script

Unity Engine
1

Hello, I’m new here and in programming and I would like to know how I can improve this script !?
In the test I find it a bit slow! At the time of changing the place image.
My android is the 7.0 = moto g5
And are testing on HVGA 480x800.
thanks for the help!

public class NewBehaviourScript : MonoBehaviour {

    public float playX;
    public bool tLeft;
    public bool tRight;
    float Ctela = 240.0f; //screem center

    void Start ()
    {
        tRight = true;

    }
    // Update is called once per frame
    void Update ()
    {
        if(Input.touchCount > 0)
        {
            if(Input.GetTouch(0).phase == TouchPhase.Began)
            {
                //variavel play x recebe o valor referente ao toque do lado direito ou esquerdo.
                playX = Input.GetTouch (0).position.x;

                /*
                 * o valor da variavel Ctela; = centro da tela; se refere a metade da tela de 480x854px 
                 * em outro tamanho de tela a variavel Ctela deve ser mudada pela (largura_da_tela / 2)
                 *
                */

                if(playX > Ctela && tRight == true)
                {
                    print ("direita");
                    transform.Translate(new Vector2(3.0f,0));
                    tLeft = true;
                    tRight = false;
                }
                else if(playX < Ctela && tLeft == true)
                {
                    print ("esquerda");
                    transform.Translate(new Vector2(-3.0f,0));
                    tRight = true;
                    tLeft = false;
                }
            }
        }
    }
}
2

Not sure what to say, as that script looks straight forward. Nothing jumps out as problematic.