2D Efficient Realtime Terrain Generation

I have some working Terrain Generation code... the only problem is that it lags ALOT... Is there any way to optimize it more for a Top Down 2D Game?

The code is on the camera object

 public void Update () {
 
         this.transform.Translate (Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"), 0);
 
         if (pos == this.transform.position) {
 
             return;
 
         }
 
         Debug.Log ("Checking...");
 
         pos = this.transform.position;
 
         int xPos = Mathf.RoundToInt (this.transform.position.x);
         int yPos = Mathf.RoundToInt (this.transform.position.y);
 
         int xLow = xPos - 9;
         int xHigh = xPos + 10;
         int yLow = yPos - 5;
         int yHigh = yPos + 6;
 
         for (int x = xLow; x < xHigh; x++) {
             for (int y = yLow; y < yHigh; y++) {
 
                 //Create TileInfo
 
                 bool isTaken = false;
 
                 foreach (Tile go in GameObject.FindObjectsOfType<Tile>()) {
 
                     if (go.pos == new Vector2 (x, y)) {
                         isTaken = true;
                     }
 
                 }
 
                 if (isTaken) {
                     continue;
                 }
 
                 TileInfo tile = new TileInfo ();
 
                 tile.tileSprite = sprites [0];
                 tile.isWalkable = true;
 
                 if (Mathf.PerlinNoise ((x + 0f) / 1, (y + 0f) / 1) >= 0.9f) {
                     tile.isWalkable = false;
                     tile.tileSprite = sprites [1];
                 }
 
                 GameObject newObject = (GameObject)Instantiate (spriteObject, new Vector3 (x, y, 0), Quaternion.identity);
 
                 newObject.GetComponent<SpriteRenderer> ().sprite = tile.tileSprite;
 
                 newObject.GetComponent<Tile> ().pos = new Vector2 (x, y);
 
             }
         }
 
     }