RPC a lot of lags (Photon)

Hi! I tried to create multiplayer scene using Photon, where a two players moving a box. But there is a lot of lags while they doing it. I used a RPC to sync position.

   using UnityEngine;
     using System.Collections;
     
     public class boxNetwork : Photon.MonoBehaviour {
     
  
         Quaternion rotation1;
         occupedBox ocBox;
        Vector3 position1;
 
 
      void Start() {
 
         oldPos = transform.position;
     
         ocBox = this.GetComponent<occupedBox>(); //the bool value when a players pick up a box
         
         }
     
     void  Update ()
     
     {
             
     if (ocBox.isOccuped) {
 photonView.RPC("SendMovement",PhotonTargets.AllBuffered, position1, rotation1);
             } else {
    position1 = gameObject.transform.position;
             }
         }
 
   

[RPC]

 void SendMovement(Vector3 position1, Quaternion rotation1)
 
 {
 
    gameObject.transform.position = position1;

 }
 
     
     }