Painless_mesh LAG and disconnect with Analog_read

I have a problem with painless mesh with ADC read whenever I change the potentiometer value in a node mesh network . the network becomes lagging and disconnected. i read on the painless_mesh that delay can make the mesh disconnect and I think that the response to this problem So
How can I fix it ??
here is the gateway code // gateway is the name of the node of esp32 that connected to PC

#include "painlessMesh.h"
#include <Arduino_JSON.h>

#define   MESH_PREFIX     "Mesh_username"
#define   MESH_PASSWORD   "mesh_password"
#define   MESH_PORT       5555
#define RXD2 16
#define TXD2 17
//String comand ;
#define Analoge_Pin 0
int Node = 1;
String temp_readings;
static int num_comand;
int SENSOR_VLAUE = 0 ;
int sensor_data;
int sel = 0 ;
String sendingmassge;
Scheduler userScheduler; 

painlessMesh  mesh;
//String obtain_readings () ;
void sendmsg() ;


int nuorder = 0 ;
//int trnsfer_string_to_number_comand(String Enter_String)
//{
//  int count = 0, num_comand, tempnum, timper, res, power;
//  num_comand = 0;
//  if (Enter_String[0] != '\0')
//  {
//    while (Enter_String[count] != '\0')
//    {
//      count++;
//    }
//    tempnum = count - 2 ;
//    count = 0 ;
//    while (comand[count] != '\0')
//    {
//
//      timper = comand[count] - '0';
//      power = pow(10, (tempnum - count));
//      num_comand += (timper * power);
//      count++;
//    }

//    return num_comand;
//  }
//}

/*String obtain_readings () 
      {
  
  
  //printf("\nstring comand = %d\n ",num_comand);
  JSONVar jsonReadings;
  jsonReadings["Node"] = Node;///={"Node":Node,"Temperature":sensor_data}
  SENSOR_VLAUE = analogRead(Analoge_Pin);
  sensor_data = map(SENSOR_VLAUE, 0, 1023, 0, 100);
  jsonReadings["Node1"] = sel;
  jsonReadings["Temperature"] = sensor_data ;///sensor value  <<<--------
  
  temp_readings = JSON.stringify(jsonReadings);
  return temp_readings;
      }*/


Task taskSendmsg( TASK_SECOND * 1 , TASK_FOREVER, &sendmsg );

void sendmsg() {
//  String msg = obtain_readings();
//  mesh.sendBroadcast(msg);

}


void receivedCallback( uint32_t from, String &msg ) {
  
  //Serial.printf("Received from %u msg=%s\n", from, msg.c_str());
  JSONVar json_object = JSON.parse(msg.c_str());
   int node = json_object["Node"]; 
   double temp = json_object["Temperature"]; 
   Serial.print("person No: ");
  Serial.println(node);
  Serial.print("\n\r");
  Serial.print("pulse rate : ");
  Serial.print(temp);
  Serial.print("\n\r");
  
}

void newConnectionCallback(uint32_t nodeId) {
    Serial.printf("New Connection, nodeId = %u\n", nodeId);
}

void changedConnectionCallback() {
  Serial.printf("Changed connections\n");
}

void nodeTimeAdjustedCallback(int32_t offset) {
    Serial.printf("Adjusted time %u. Offset = %d\n", mesh.getNodeTime(),offset);
}

void setup() {
  
  Serial.begin(115200);
  Serial2.begin(9600, SERIAL_8N1, RXD2, TXD2);
  mesh.setDebugMsgTypes( ERROR | STARTUP );  

  mesh.init( MESH_PREFIX, MESH_PASSWORD, &userScheduler, MESH_PORT );
  mesh.onReceive(&receivedCallback);
  mesh.onNewConnection(&newConnectionCallback);
  mesh.onChangedConnections(&changedConnectionCallback);
  mesh.onNodeTimeAdjusted(&nodeTimeAdjustedCallback);
  userScheduler.addTask( taskSendmsg );
  taskSendmsg.enable();
}

void loop() {
  
  mesh.update();
//  comand  = Serial.readString( );//num_comand
//  num_comand =  trnsfer_string_to_number_comand(comand);
//  switch(num_comand)
//  {
//    case 1 :
//    sel = 1 ;
//    break;
//    default : sel = 0 ;
//  }
}

///////////////////////////////////////////////////////////////////////////////////////////
and here is the Sensor node as esp8266 that has a problem

#include "painlessMesh.h"
#include <Arduino_JSON.h>

#define   MESH_PREFIX     "Mesh_username"
#define   MESH_PASSWORD   "mesh_password"
#define   MESH_PORT       5555

String comand ;
#define Analoge_Pin 0
int Node = 1;
String temp_readings;

int SENSOR_VLAUE = 0 ;
int sensor_data;

Scheduler userScheduler; 
painlessMesh  mesh;
String obtain_readings () ;
void sendmsg() ;
void ADC_f();


//int trnsfer_string_to_number_comand(String Enter_String)
//{
//  int count = 0, num_comand, tempnum, timper, res, power;
//  num_comand = 0;
//  if (Enter_String[0] != '\0')
//  {
//    while (Enter_String[count] != '\0')
//    {
//      count++;
//    }
//    tempnum = count - 2 ;
//    count = 0 ;
//    while (comand[count] != '\0')
//    {
//
//      timper = comand[count] - '0';
//      power = pow(10, (tempnum - count));
//      num_comand += (timper * power);
//      count++;
//    }
//
//    return num_comand;
//  }
//}

String obtain_readings () 
      {
  JSONVar jsonReadings;
  jsonReadings["Node"] = Node;
  
  jsonReadings["Temperature"] = sensor_data ;///sensor value  <<<--------
  temp_readings = JSON.stringify(jsonReadings);
  return temp_readings;
      }


Task taskSendmsg( TASK_SECOND * 1 , TASK_FOREVER, &sendmsg );
Task ADC_massage( TASK_SECOND * 1 , TASK_FOREVER, &ADC_f );
void sendmsg() {
  String msg = obtain_readings();
  mesh.sendBroadcast(msg);
}
void ADC_f()
{
  SENSOR_VLAUE = analogRead(Analoge_Pin);
  sensor_data = map(SENSOR_VLAUE, 0, 1023, 0, 100);
}

void receivedCallback( uint32_t from, String &msg ) {
  //Serial.printf("Received from %u msg=%s\n", from, msg.c_str());
  JSONVar json_object = JSON.parse(msg.c_str());
   int node = json_object["Node"]; 
   int rev_order = json_object["Node1"];
   String revedorder ;
   double temp = json_object["Temperature"]; 
   Serial.print("person No: ");
  Serial.println(node);
  Serial.print("\n\r");
  Serial.print("pulse rate : ");
  Serial.print(temp);
  Serial.print("\n\r");
  printf("\norder = %d \n",rev_order);
  
}

void newConnectionCallback(uint32_t nodeId) {
    Serial.printf("New Connection, nodeId = %u\n", nodeId);
}

void changedConnectionCallback() {
  Serial.printf("Changed connections\n");
}

void nodeTimeAdjustedCallback(int32_t offset) {
    Serial.printf("Adjusted time %u. Offset = %d\n", mesh.getNodeTime(),offset);
}

void setup() {
  Serial.begin(115200);
  
  mesh.setDebugMsgTypes( ERROR | STARTUP );  

  mesh.init( MESH_PREFIX, MESH_PASSWORD, &userScheduler, MESH_PORT );
  //mesh.onReceive(&receivedCallback);
  mesh.onNewConnection(&newConnectionCallback);
  mesh.onChangedConnections(&changedConnectionCallback);
  mesh.onNodeTimeAdjusted(&nodeTimeAdjustedCallback);

  userScheduler.addTask( taskSendmsg );
  userScheduler.addTask( ADC_massage );
  taskSendmsg.enable();
  ADC_massage.enable();
}

void loop() {
  comand  = Serial.readString( );//num_comand
  mesh.update();
}