JSFiddle - React, Tailwind, and code Playground

JavaScript

(function(){
      var factor = 10;

      function slower(x){
        return function(){
          return x.apply(this,arguments)/factor;
        }
      }

      function longer(x){
        return function(f, time){
          time = time * factor;
          return x.apply(this,arguments);
        }
      }

      Date.prototype.getTime = slower(Date.prototype.getTime);
      Date.now = slower(Date.now);
      setTimeout = longer(setTimeout);
      setInterval = longer(setInterval);
    })()
        
////////////////////////////////////
        
setInterval(function(){
  document.write(Date.now()+"<br/>");
},1000);