Game freezes up for a second after executing code, how do I fix this?

Hello, I created a script to have a boss character fire a laser using the line renderer, it works well enough for my purposes but to get the effect my code is kind of sloppy and during part of the code execution towards the end the game will freeze for a split second before resuming. How can I fix or trim down my code to prevent this?

 public class anemoneLaser : MonoBehaviour {
 
     public BossBehavior bossBehavior;
 
     public float laserWidth;
     public float laserTimer;
     public float startTimer;
     private float nextShot;
     private float nextStartUp;
     public bool laserStarting;
     public bool laserReady;
     public bool laserOff;
     public float minWidth = 0;
     public float maxWidth = 2.3f;
     LineRenderer redLaser;
     ParticleSystem laserSparks;
 
     private AudioSource laserCharge;
     private AudioSource laserShot;
 
     // Use this for initialization
     void Start ()
     {
         GameObject bossBehaviorObject = GameObject.FindWithTag("Boss");
         if (bossBehaviorObject != null)
         {
             bossBehavior = bossBehaviorObject.GetComponent<BossBehavior>();
         }
         if (bossBehavior == null)
         {
             Debug.Log("Cannot find 'BossBehavior' script");
         }
 
         AudioSource[] laserSounds = GetComponents<AudioSource>();
         laserCharge = laserSounds[0];
         laserShot = laserSounds[1];
 
         laserTimer = nextShot;
         startTimer = nextStartUp;
 
         laserWidth = 0;
 
         redLaser = GetComponent<LineRenderer>();
         SpriteRenderer spriteRenderer = GetComponent<SpriteRenderer>();
         redLaser.sortingLayerID = spriteRenderer.sortingLayerID;
         redLaser.sortingOrder = spriteRenderer.sortingOrder;
         redLaser.widthMultiplier = laserWidth;
 
         laserSparks = GetComponentInChildren<ParticleSystem>();
         laserSparks.Pause();
     }
     
     // Update is called once per frame
     void Update ()
     {
         redLaser = GetComponent<LineRenderer>();
         redLaser.widthMultiplier = laserWidth;
 
         if (laserWidth < 0)
         {
             laserWidth = 0;
         }
         // Starting countdown for laser
         if (laserStarting)
         {
             laserOff = false;
             startTimer -= Time.deltaTime;
         }
 
         if (bossBehavior.bossActive && laserStarting && startTimer < 0 && !laserOff)
         {
             laserWidth = 0.1f; //sets laser to a minimum width so player knows its about to go off
             laserStarting = false;
             laserCharge.Play();
             laserSparks.Play();
             StartCoroutine(PrepareToFire());   
         }
         //Laser ready to fire
         if (laserReady)
         {
             laserTimer -= Time.deltaTime;
         }
 
         if (bossBehavior.bossActive && laserReady && laserTimer < 0 && !laserOff)
         {
             
             StartCoroutine(FirinMahLaser());
         }
 
     }
     IEnumerator PrepareToFire()
     {
         yield return new WaitForSeconds(0.8f);
         Debug.Log("PrepareToFire()");
         startTimer = nextStartUp;
         laserReady = true;
         
     }
     // Increases width of laser to maxWidth value before finishing and going into Cool Down
     IEnumerator FirinMahLaser()
     {
         //laserShot.Play(); //Not sure where to place this yet so it doesn't play more then once
         yield return new WaitForSeconds(3.5f);
         laserTimer = nextShot;
         
         if (laserWidth < maxWidth && !laserOff)
         {
             Debug.Log("Adding Width");
             laserWidth += 0.1f;
         }
         else if (laserWidth >= maxWidth && !laserOff)
         {
             yield return new WaitForSeconds(2.0f);
             Debug.Log("Laser Width at Max");
             StartCoroutine(CoolingOff());
         }
 
     }
     //Called to reduce width and turn off laser then move on to prepare for the next firing
     IEnumerator CoolingOff()
     {
         while (laserWidth > minWidth && !laserOff)
         {
             Debug.Log("Cooling off WHILE loop");
             laserWidth -= 0.01f;
         }
         if(laserWidth <= minWidth && !laserOff)
         {
             
             Debug.Log("WHILE loop broken");
             laserSparks.Stop();
             laserOff = true;
             laserStarting = false;
             laserReady = false;
             yield return new WaitForSeconds(10.0f);
             StartCoroutine(PrepNext());
         }
     }
     //Prepare for next laser
     IEnumerator PrepNext()
     {
         Debug.Log("PrepNext()");
         
         laserWidth = 0;
         laserTimer = nextShot;
         startTimer = nextStartUp;
         yield return new WaitForSeconds(2.0f);
         laserStarting = true;
     }
    //TODO Add collision to laser
 }

The freeze up happens after the while loop is broken, maybe that's what is creating the lag? Any help would be appreciated. Thanks.