How to Check is Internet Available without creating overhead in Unity3d

I Need to check that if internet is avaiable or not in my games so that i make decission. There are two different types of decission when internet is working and when internet is not working. current i found a way but it create a overhead to cpu. Current i am using this type of solutions . is there a better way to check either internet is avaiable or not.

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class DeviceConnected : MonoBehaviour
 {
     private const bool allowCarrierDataNetwork = false;
     private const string pingAddress = "8.8.8.8"; // Google Public DNS server
     private const float waitingTime = 2.0f;
     public Text txtInternetConnectStatus;
     private Ping ping;
     private float pingStartTime;
    
 
     public void Start()
     {
         InvokeRepeating("OnStartCheck", 0f,3.0f);
 
     }
 
     public void OnStartCheck()
     {
         bool internetPossiblyAvailable;
         switch (Application.internetReachability)
         {
             case NetworkReachability.ReachableViaLocalAreaNetwork:
                 internetPossiblyAvailable = true;
                 break;
             case NetworkReachability.ReachableViaCarrierDataNetwork:
                 internetPossiblyAvailable = allowCarrierDataNetwork;
                 break;
             default:
                 internetPossiblyAvailable = false;
                 break;
         }
         if (!internetPossiblyAvailable)
         {
             InternetIsNotAvailable();
             return;
         }
         ping = new Ping(pingAddress);
         pingStartTime = Time.time;
     }
     public void Update()
     {
         if (ping != null)
         {
             Debug.Log("Hi");
             bool stopCheck = true;
             if (ping.isDone)
             {
                 if (ping.time >= 0)
                     InternetAvailable();
                 else
                     InternetIsNotAvailable();
             }
             else if (Time.time - pingStartTime < waitingTime)
                 stopCheck = false;
             else
                 InternetIsNotAvailable();
             if (stopCheck)
                 ping = null;
         }
     }
 
 
 
     private void InternetIsNotAvailable()
     {
  
             Debug.Log("No Internet :(");
             txtInternetConnectStatus.text = "No Internet :(";
             isInternetAvailable = true;
       
     }
 
     private void InternetAvailable()
     {
   
             Debug.Log("Internet is available! ;)");
             txtInternetConnectStatus.text = "Internet is available! ;)";
             isInternetAvailable = false;
 
      
 
     }
 
 

 }