24m tri 50m verts from 300 trees

hello.

So i wrote this script to spawn choppable trees from a prefab and finally got it working correctly. Now i am running into problems when trying to optimize the forest of only 300 trees. I checked static in the inspector and it did not help at all I am not saving anything while trying to batch them together. what else can i do to get these numbers down. I am currently getting only 3 to 6 fps when i look at a section of trees.

could it be the tree model that I am using to high of a poly count? 24m triangles and 50m verts are big numbers. ya im getting millions that's not a typo.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class RandomizeObj : MonoBehaviour {
     public Transform obj;
     public Vector3 postiion;
     public GameObject objspawned;
     public int totalobjs;
     public float ObjectsetWidth;
     public float ObjectsetLength;
     public float respawntime = 3600.0f;
     public float respawn = 3600.0f;
     //respawn object if destryed after 60minutes - 3600 Seconds - 3600000.0f milliseconds
 
 
     void Start () {
 
         int spawned = 0;
 
         while (spawned <= totalobjs) {
             Vector3 position = new Vector3 (transform.position.x + Random.value * ObjectsetWidth, transform.position.y, transform.position.z + Random.value * ObjectsetLength);
 
             RaycastHit hit = new RaycastHit ();
 
             if (Physics.Raycast (position, Vector3.down, out hit)) {
 
                 Transform newObj = (Transform) Instantiate (obj, hit.point, Quaternion.identity);
                 newObj.transform.SetParent (transform);
 
                 newObj.name = gameObject.name + "_Obj" + spawned;
             }
             spawned++;
         }
 
 
 
     }
     void Update() {
         respawntime -= Time.deltaTime;
         if (respawntime < 0) {
             CheckForTrees ();
         }
     }
     void CheckForTrees() {
         int i = 0;
         while (i < totalobjs) {
 
             Vector3 position = new Vector3 (transform.position.x + Random.value * ObjectsetWidth, transform.position.y, transform.position.z + Random.value * ObjectsetLength);
 
             objspawned = GameObject.Find(gameObject.name + "_Obj" + i);
 
             if (objspawned == null) {
                 
                 RaycastHit hit = new RaycastHit ();
                 if (Physics.Raycast (position, Vector3.down, out hit)) {
                     Transform newObj = (Transform)Instantiate (obj, hit.point, Quaternion.identity);
                     newObj.transform.SetParent (transform);
 
                     newObj.name = gameObject.name + "_Obj" + i;
                     Debug.Log ("Not Found Object at " + i);
                 } 
             }
 
             i++;
         }
         respawntime = respawn;
 
     }
 }