Rotate camera smooth on touch

Hello,

I'am working on a camera script which rotates on touch. But the problem is, the movement is far from smooth, i'am using the following code:

 var target : Transform;
 var distance = 10.0;
  
 var xSpeed = 250.0;
 var ySpeed = 120.0;
  
 var yMinLimit = -20;
 var yMaxLimit = 80;
  
 private var x = 0.0;
 private var y = 0.0;
  
 var xsign = 1;
 
 var gasPedal : GUITexture;
 var brakePedal : GUITexture;
 var transmissionControl : GUITexture;
 var steeringWheel : TouchSteering;
 
 var hitGUI : boolean;
 
 var touchPosition : Vector2;
  
 @script AddComponentMenu("Camera-Control/Mouse Orbit")
  
 function Start () {
     var angles = transform.eulerAngles;
     x = angles.y;
     y = angles.x;
     
     var rotation = Quaternion.Euler(y, x, 0);
     var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
         
     transform.rotation = rotation;
     transform.position = position;    
 }
  
 function Update() {
     var forward = transform.TransformDirection(Vector3.up);
     var forward2 = target.transform.TransformDirection(Vector3.up);
     
      if (Vector3.Dot(forward,forward2) < 0)
          xsign = -1; 
      else
         xsign = 1;
     
     
     for (var touch : Touch in Input.touches) {
         touchPosition = touch.deltaPosition * Time.deltaTime / touch.deltaTime;
         if (touch.phase == TouchPhase.Moved && !guiHit()) {
             x += xsign * touchPosition.x * xSpeed * 0.02;
             y -= touchPosition.y * ySpeed * 0.02;
             
             y = Mathf.Clamp(y, yMinLimit, yMaxLimit);
                                                                                              
             var rotation = Quaternion.Euler(y, x, 0);
             var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
             
             transform.rotation = rotation;
             transform.position = position;
         }
     }
 }

Fluxxi