Simplifying a script

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class FlyingEnemy : MonoBehaviour 
 {
     private float amplitudeZ = 5.0f;
     private float amplitudeY = 3.0f;
     private float omegaZ = 2.0f;
     private float omegaY = 2.0f; 
     public EnemySpawn eSpawn;
     
     public int place;
 
 
     private float timeI;
     
     private float mTime0;
     private float mTime1;
     private float mTime2;
     private float mTime3;
     private float mTime4;
 
     //keeps current position of objects
     public List<Vector3> posList = new List<Vector3>();
 
     void setVars()
     {
         posList.Add (eSpawn.eSnake [0].transform.position);
         posList.Add (eSpawn.eSnake [1].transform.position);
         posList.Add (eSpawn.eSnake [2].transform.position);
         posList.Add (eSpawn.eSnake [3].transform.position);
         posList.Add (eSpawn.eSnake [4].transform.position);
     }
     
     public void Snaker()
     {
 
 
         float y0;
         float y1;
         float y2;
         float y3;
         float y4;
 
         Vector3 v0 = posList [0];
         Vector3 v1 = posList [1];
         Vector3 v2 = posList [2];
         Vector3 v3 = posList [3];
         Vector3 v4 = posList [4];
 
         Vector3 leader0 = eSpawn.eSnake [0].transform.position;
         Vector3 leader1 = eSpawn.eSnake [1].transform.position;
         Vector3 leader2 = eSpawn.eSnake [2].transform.position;
         Vector3 leader3 = eSpawn.eSnake [3].transform.position;
 
 
         Vector3 toLeader0 = leader0 - transform.position;
         Vector3 toLeader1 = leader1 - transform.position;
         Vector3 toLeader2 = leader2 - transform.position;
         Vector3 toLeader3 = leader3 - transform.position;
 //
 //        Quaternion wantDir0 = Quaternion.LookRotation(toLeader0);
 //        Quaternion wantDir1 = Quaternion.LookRotation(toLeader1);
 //        Quaternion wantDir2 = Quaternion.LookRotation(toLeader2);
 //        Quaternion wantDir3 = Quaternion.LookRotation(toLeader3);
 
         timeI += Time.deltaTime;
 
         mTime0 += Time.deltaTime;
         if (mTime0 > 0.1f)mTime1 += Time.deltaTime;
         if (mTime1 > 0.1f)mTime2 += Time.deltaTime;
         if (mTime2 > 0.1f)mTime3 += Time.deltaTime;
         if (mTime3 > 0.1f)mTime4 += Time.deltaTime;
 
         
         float z = (omegaZ * amplitudeZ);
 
               y0 = Mathf.Abs (amplitudeY * Mathf.Sin (omegaY * mTime0));
               y1 = Mathf.Abs (amplitudeY * Mathf.Sin (omegaY * mTime1));
               y2 = Mathf.Abs (amplitudeY * Mathf.Sin (omegaY * mTime2));
               y3 = Mathf.Abs (amplitudeY * Mathf.Sin (omegaY * mTime3));
               y4 = Mathf.Abs (amplitudeY * Mathf.Sin (omegaY * mTime4));
 
 
         eSpawn.eSnake [0].transform.position = new Vector3 (0.0f, v0.y + y0, v0.z -z * timeI);
 
         eSpawn.eSnake [1].transform.position = new Vector3 (0.0f, v1.y + y1, v1.z -z * timeI);
 //        eSpawn.eSnake [1].transform.rotation = Quaternion.RotateTowards(transform.rotation, wantDir0, 360*Time.deltaTime);
 
         eSpawn.eSnake [2].transform.position = new Vector3 (0.0f, v2.y + y2, v2.z -z * timeI);
 //        eSpawn.eSnake [2].transform.rotation = Quaternion.RotateTowards(transform.rotation, wantDir1, 360*Time.deltaTime);
 
         eSpawn.eSnake [3].transform.position = new Vector3 (0.0f, v3.y + y3, v3.z -z * timeI);
 //        eSpawn.eSnake [3].transform.rotation = Quaternion.RotateTowards(transform.rotation, wantDir2, 360*Time.deltaTime);
 
         eSpawn.eSnake [4].transform.position = new Vector3 (0.0f, v4.y + y4, v4.z -z * timeI);
 //        eSpawn.eSnake [4].transform.rotation = Quaternion.RotateTowards(transform.rotation, wantDir3, 360*Time.deltaTime);
 
     }
     
 
     // Update is called once per frame
     void Update () 
     {
         Invoke ("setVars", 0.5f);
         Invoke ("Snaker", 1.0f);
     }
 
 
 }
 

That problem with this is the rotation part. Which is why it's commented out. If it isn't it causes huge amounts of lag.

So I was wondering if I could get some help altering this script so that I can get the rotation in there without causing my computer to explode.