Help to stump basic touch script

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!

Code (CSharp):

1. public class NewBehaviourScript : MonoBehaviour {
2.  
3.     public float playX;
4.     public bool tLeft;
5.     public bool tRight;
6.     float Ctela = 240.0f; //screem center
7.  
8.     void Start ()
9.     {
10.         tRight = true;
11.  
12.     }
13.     // Update is called once per frame
14.     void Update ()
15.     {
16.         if(Input.touchCount > 0)
17.         {
18.             if(Input.GetTouch(0).phase == TouchPhase.Began)
19.             {
20.                 //variavel play x recebe o valor referente ao toque do lado direito ou esquerdo.
21.                 playX = Input.GetTouch (0).position.x;
22.  
23.                 /*
24.                  * o valor da variavel Ctela; = centro da tela; se refere a metade da tela de 480x854px
25.                  * em outro tamanho de tela a variavel Ctela deve ser mudada pela (largura_da_tela / 2)
26.                  *
27.                 */
28.  
29.                 if(playX > Ctela && tRight == true)
30.                 {
31.                     print ("direita");
32.                     transform.Translate(new Vector2(3.0f,0));
33.                     tLeft = true;
34.                     tRight = false;
35.                 }
36.                 else if(playX < Ctela && tLeft == true)
37.                 {
38.                     print ("esquerda");
39.                     transform.Translate(new Vector2(-3.0f,0));
40.                     tRight = true;
41.                     tLeft = false;
42.                 }
43.             }
44.         }
45.     }
46. }

 

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