Forward movement Slow? Delta.time? Frame Rate?

Hey I honestly dont know what I am doing with script I have just used ones from the web but as soon as I got the AI script for my enemy, my players forward movement became really slow. However when I look in the sky it become how it should. I have read a lot on hear but could really do with some help.

Thanks for your time.

Hears the AI script,

 var Distance;
 var Target : Transform;
 var lookAtDistance = 25.0;
 var attackRange = 15.0;
 var moveSpeed = 5.0;
 var Damping = 6.0;
 
 function Update ()
 {
     Distance = Vector3.Distance(Target.position, transform.position);
     
     if (Distance < lookAtDistance)
     {
         
         lookAt();
     }
     
     
     if (Distance < attackRange)
     {
         
         attack ();
     }
 }
 
 function lookAt ()
 {
     var rotation = Quaternion.LookRotation(Target.position - transform.position);
     transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * Damping);
 }
 
 function attack ()
 {
     transform.Translate(Vector3.forward * moveSpeed * Time.deltaTime);
 }