Animation Script Help

I have wrote this script which kind of does what I want it too; I want it to play an idle animation if nothing is being pressed play a walk animation when w or s is pressed, play a shoot animation when the LMB is clicked and play a reload animation when r is pressed. All this works but the shoot animation sort of delays which I dont want. Can anyone help me out with this?

this is my script,

 function Start () {

animation.wrapMode = WrapMode.Loop;

animation["idle"].speed = 0.2;

animation["walk"].speed = 1;

animation["reload"].speed = 1;

animation["shoot"].speed = 2;

animation["shoot"].wrapMode = WrapMode.Once;

animation["reload"].wrapMode = WrapMode.Once;

animation["shoot"].layer = 1;

animation["reload"].layer = 2;

animation.Stop();

}

function Update () {

if (Mathf.Abs(Input.GetAxis("Vertical")) > 0.1)

   animation.CrossFade("walk");

else

   animation.CrossFade("idle");

if(Input.GetButtonDown("Fire1"))

   animation.CrossFade("shoot");

   

   

if (Input.GetButtonDown("r"))

    animation.CrossFade("reload");   

}