Smooth camera rotation on mobile and pc when GetMouseButton()?

Hi,

I wrote this script here:

Code (CSharp):

1.     if (Input.GetMouseButton (0)) {
2.  
3.         camRotation.x = Input.GetAxis("Mouse X");
4.         camRotation.y = Input.GetAxis("Mouse Y");
5.  
6.         camRotation.x *= rotationSpeed.x;
7.         camRotation.y *= rotationSpeed.y;
8.         camRotation *= Time.deltaTime;
9.      
10.         transform.Rotate( 0, camRotation.x, 0, Space.World );
11.  
12.         transform.Rotate( -camRotation.y, 0, 0 );
13.      
14.     }

This code works, but the rotation on my mobile device is not smooth. It's a little bit jerky.

How can I make it smoother?

And I want, that the camera rotates slowly or fast depending on the swipe.

Can somebody give me some tips?

Thanks.