Raycast collider detector lags horribly?

This script makes the game drop down from 30 fps to 3 fps. Here they seem to do it no problem(start at 1:00): http://www.youtube.com/watch?v=Y2C2Y3PiCM8

What is making the lag?

 #pragma strict
 
 var wake : boolean;
 
 var power : float = 1000;
 var damage : int = 1;
 var radius : float = 3;
 
 function Start () {
 
 }
 
 function Update () {
     if(wake == true) {
         Explode();
     }
 }
 
 function Explode() {
  
     var colliders : Collider[] = Physics.OverlapSphere (transform.position, radius);
     Debug.Log("Count of colliders = "+colliders.Length);
         for (var collider : Collider in colliders) {
             //if (collider.tag == "brick" || collider.tag == "player") {
                 Debug.Log("Found brick or a player");
                 var hit : RaycastHit;
                 if (Physics.Linecast(transform.position, collider.transform.position, hit)) {
                     if (hit.collider == collider) {
                     Debug.Log("No obstructions");
                         if (hit.rigidbody)
                             hit.rigidbody.AddExplosionForce(power, transform.position, radius, 3.0);
                 }
             }
         }
     //}
 }