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

I wrote this script here. It's working, but it's a little bit jerky on mobile device. How can I make it smoother?

 camRotation.x = Input.GetAxis("Mouse X");
 camRotation.y = Input.GetAxis("Mouse Y");

 if (Input.GetMouseButton (0)) {

     camRotation.x *= rotationSpeed.x;
     camRotation.y *= rotationSpeed.y;
     camRotation *= Time.deltaTime;
     
     transform.Rotate( 0, camRotation.x, 0, Space.World );
     
     transform.Rotate( -camRotation.y, 0, 0 );    
     
 }

And when it's possible, I want, that the camera rotates slowly or fast depending on the swipe distance.