Bug Group movement navigation works incorrect in build but it works correctly in editor

I have 1024 3D animated characters with Navmesh agent and Navigation script that updates Navmesh when new buildings , walls gates or towers are instanciated. (characters can go on the walls, stairs, some buildings, towers and gatehouses). when I run the game in the editor, over 10 times more characters move when I move them with command and all 1024 characters reach the destination in a shorter amount of time because they move together but when I build the game, characters move one by one and it takes over 10 times more time for all 1024 characters to reach their destination.
my game is a medieval RTS and the script of runtime Navmesh generation is below :

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.AI;
3. using System.Collections;
4. using System.Collections.Generic;
5. using NavMeshBuilder = UnityEngine.AI.NavMeshBuilder;
6.  
7. // Build and update a localized navmesh from the sources marked by NavMeshSourceTag
8. [DefaultExecutionOrder(-102)]
9. public class LocalNavMeshBuilder : MonoBehaviour
10. {
11.     // The center of the build
12.     public Transform m_Tracked;
13.  
14.     // The size of the build bounds
15.     public Vector3 m_Size = new Vector3(80.0f, 20.0f, 80.0f);
16.  
17.     NavMeshData m_NavMesh;
18.     AsyncOperation m_Operation;
19.     NavMeshDataInstance m_Instance;
20.     List<NavMeshBuildSource> m_Sources = new List<NavMeshBuildSource>();
21.  
22.     IEnumerator Start()
23.     {
24.         while (true)
25.         {
26.             UpdateNavMesh(true);
27.             yield return m_Operation;
28.         }
29.     }
30.  
31.     void OnEnable()
32.     {
33.         // Construct and add navmesh
34.         m_NavMesh = new NavMeshData();
35.         m_Instance = NavMesh.AddNavMeshData(m_NavMesh);
36.         if (m_Tracked == null)
37.             m_Tracked = transform;
38.         UpdateNavMesh(false);
39.     }
40.  
41.     void OnDisable()
42.     {
43.         // Unload navmesh and clear handle
44.         m_Instance.Remove();
45.     }
46.  
47.     void UpdateNavMesh(bool asyncUpdate = false)
48.     {
49.         NavMeshSourceTag.Collect(ref m_Sources);
50.         var defaultBuildSettings = NavMesh.GetSettingsByID(0);
51.         var bounds = QuantizedBounds();
52.  
53.         if (asyncUpdate)
54.             m_Operation = NavMeshBuilder.UpdateNavMeshDataAsync(m_NavMesh, defaultBuildSettings, m_Sources, bounds);
55.         else
56.             NavMeshBuilder.UpdateNavMeshData(m_NavMesh, defaultBuildSettings, m_Sources, bounds);
57.     }
58.  
59.     static Vector3 Quantize(Vector3 v, Vector3 quant)
60.     {
61.         float x = quant.x * Mathf.Floor(v.x / quant.x);
62.         float y = quant.y * Mathf.Floor(v.y / quant.y);
63.         float z = quant.z * Mathf.Floor(v.z / quant.z);
64.         return new Vector3(x, y, z);
65.     }
66.  
67.     Bounds QuantizedBounds()
68.     {
69.         // Quantize the bounds to update only when theres a 10% change in size
70.         var center = m_Tracked ? m_Tracked.position : transform.position;
71.         return new Bounds(Quantize(center, 0.1f * m_Size), m_Size);
72.     }
73.  
74.     void OnDrawGizmosSelected()
75.     {
76.         if (m_NavMesh)
77.         {
78.             Gizmos.color = Color.green;
79.             Gizmos.DrawWireCube(m_NavMesh.sourceBounds.center, m_NavMesh.sourceBounds.size);
80.         }
81.  
82.         Gizmos.color = Color.yellow;
83.         var bounds = QuantizedBounds();
84.         Gizmos.DrawWireCube(bounds.center, bounds.size);
85.  
86.         Gizmos.color = Color.green;
87.         var center = m_Tracked ? m_Tracked.position : transform.position;
88.         Gizmos.DrawWireCube(center, m_Size);
89.     }
90. }

why characters don't move together in build but they move together in the editor? and how to fix it?