Performance Question

Hello, i have a somewhat simple scene- a player made of 3 cubes, with a rigidbody and special movement/GUI script, and a 3d map made of strictly cubes in this way:

 Cubes {
     simpleMaterials; //diffuse materials with simple texture;
     script; //that only Destroys the cube OnMouseDown();
 }

all the mapCubes are under one empty GameObject, and i put a script on that parent gameObject to see how many cubes are present, and the console reported `9469` cubes! The editor works fine, i'm not sure about the build yet.

I was wondering, if i added a script to save and load the cubes' positions using PlayerPrefsX, would that hurt the performance at all? it seems like it only effects the performance in the editor when i duplicate/move/rotate large chunks of cubes.

save/load script in mind:

 using UnityEngine; 
 using System.Collections; 
 
 [AddComponentMenu("Controls/Save-Load-AND-Count-Children")]
 [ExecuteInEditMode]
 
 public class CountChildren: MonoBehaviour {
     
     public Transform[] pos; //in the editor, pos.Length = 9469;
     
     
     void Awake() {
         print(transform.childCount);
     }
     
     
     void Update() {
         if(Operations.sOperation == "Save") SaveMap();
         if(Operations.sOperation == "Load") LoadMap();
     }
     
     
     void SaveMap() {
         for (int i0=0; i0<pos.Length; i0++) {
             PlayerPrefsX.SetVector3("MapBlock"+i0.ToString("f0"),pos[i0].position);
         }
     }
     void LoadMap() {
         for (int i1=0; i1<pos.Length; i1++) {
             pos[i1].position = PlayerPrefsX.GetVector3("MapBlock"+i1.ToString("f0"));
         }
     }
 }

EDIT:

ok, thanks. so this revised script:

 using UnityEngine; 
 using System.Collections; 
 
 [AddComponentMenu("Controls/Save-Load-AND-Count-Children")]
 [ExecuteInEditMode]
 
 public class CountChildren: MonoBehaviour {
     
     public Transform[] pos; //in the editor, pos.Length = 9469;
     
     
     void Awake() {
         print(transform.childCount);
     }
     
     
     void Update() {
         if(Operations.sOperation == "Save") SaveMap();
         if(Operations.sOperation == "Load") LoadMap();
     }
     
     
     void SaveMap() {
         for (int i0=0; i0<pos.Length; i0++) {
             PlayerPrefsX.SetVector3("MapBlock"+i0.ToString("f0"),pos[i0].position);
             Operations.sOperation = "";
         }
     }
     void LoadMap() {
         for (int i1=0; i1<pos.Length; i1++) {
             pos[i1].position = PlayerPrefsX.GetVector3("MapBlock"+i1.ToString("f0"));
             Operations.sOperation = "";
         }
     }
 }

shouldn't hurt the performance? since after it saves or loads, it resets the text so that it will stop saving/loading.