Fast.com (spped chart in graph)

fast.js

// ==UserScript==
// @name         Fast.com (spped chart in graph)
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  spped chart in graph
// @author       Saiful Islam
// @match        https://fast.com/
// @icon         https://www.google.com/s2/favicons?domain=fast.com
// @require      http://code.jquery.com/jquery-3.4.1.min.js
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
     var checkSpeed = setInterval(function(){
          console.log('Checking...');
          var speed = $("#speed-value.succeeded").text();
         var unit = $("#speed-units").text();
         if(unit=="Kbps"){ speed = Number(speed) / 1024; }
          if(speed){
               var old_data = JSON.parse(localStorage.getItem('fast_speed'));
               if(!old_data){
                    old_data = [];
               }

               var new_data = {'speed': speed, 'time': new Date().toLocaleString()};
               old_data.push(new_data);
               var stringify = JSON.stringify(old_data);
               localStorage.setItem('fast_speed', stringify);

               var dates = [];
               var speeds = [];

               $.each(old_data, function(i,v){
                    dates.push(v.time);
                    speeds.push(v.speed);
               });

               var json_chart = {type:'bar',data:{labels:dates, datasets:[{label:'Speed',data:speeds}]}};
               var image_url = "https://quickchart.io/chart?c=" + JSON.stringify(json_chart);
               console.log(image_url);

               $('.your-speed-message').html('<img src=\'' + image_url + '\' width="100%" /><br><a href="javascript:{};" onclick="localStorage.setItem(\'fast_speed\', null);">Reset Graph</a>');

               console.log(stringify);
               console.log('https://jsontochart.com/');
               clearInterval(checkSpeed);
               setTimeout(function(){ window.location.reload(); }, 1000*60*5);
          }
     }, 1000*5);
})();