Help optimize code

I am looking for some help with this code, I am making the game for android so every CPU cycle counts. With 3 enemies the game runs at approx 45fps. With 7 enemies it drops to around 15 fps. Checking the profiler this script is the next highest activity after camera render. I am looking for any help to optimize this code to see if that helps with FPS. To increase performance the enemy does not have a rigidbody as the physics involved were hogging the CPU.

 #pragma strict
 
 var player : Transform;
 static var mummySpeed : float = 6;
 var direction: float;
 var timesHit:int;
 var touchingPlayer:boolean;
 var immune:boolean;
 var mummyTexture:Texture2D;
 var mummyHitTexture:Texture2D;
 var mummyDamage1:Texture2D;
 var mummyDamage2:Texture2D;
 var mummyRig:GameObject;
 
 
 var playerMidSection: Vector3;
 
 
 function Update () {
     if(Vector3.Distance(player.position, transform.position) > 8){
         touchingPlayer = false;
         direction = Random.value;
         
         // Cast ray to player
         var hit : RaycastHit;
         var rayDirection = (player.position) - transform.position;
         
         
         if (Physics.Raycast (transform.position, rayDirection, hit)) {
             
             if (hit.transform == player) {
                 // enemy can see the player!
                 transform.LookAt(player);
                 transform.Translate(Vector3(0,0,mummySpeed) * Time.deltaTime);
                 
                 //Debug.Log("I see You");
             }
             else {
                 // there is something obstructing the view randomly wander
                 //Debug.Log("Im blind!!");
                 transform.Translate(Vector3(0,0,mummySpeed) * Time.deltaTime);
             }
         }
         //Debug.DrawLine(transform.position, player.position, Color.green);
         var bodyForwardRay = transform.TransformDirection(Vector3(0,0,2));
         if(Physics.Raycast(transform.position, bodyForwardRay, hit, 2)){
             if (hit.collider.gameObject.tag == "Wall" ||  hit.collider.gameObject.tag == "Chest" ||  hit.collider.gameObject.tag == "Eye" ||  hit.collider.gameObject.tag == "Life" ||  hit.collider.gameObject.tag == "Sarchoph"){
                 if (direction < 0.5){
                     transform.Rotate (0,35,0);
                 }
                 else{
                     transform.Rotate (0,-35,0);
                 }
             }
         }
     }
     else
     {
         touchingPlayer = true;
         GlobalVariables.health = GlobalVariables.health - 0.2;
     }
 }
 
 
 function OnMouseDown ()
 {
     if (touchingPlayer == true && immune == false){
         MummyHit();
     }
 }
 
 function MummyHit(){
     mummyRig.renderer.material.mainTexture = mummyHitTexture;
     immune = true;
     timesHit++;
     yield WaitForSeconds(0.5);
     immune = false;
     if (timesHit == 1){
         mummyRig.renderer.material.mainTexture = mummyDamage1;
     }
     if (timesHit == 2){
         mummyRig.renderer.material.mainTexture = mummyDamage2;
     }
     if (timesHit == 3){
         Destroy(gameObject);
     }
 }