Fill the browser window with random digits

I would like to fill the visible window in a webpage with random digits. The way I am currently trying to do this involves a long string of random digit first, and then using the following property on a div:

 #mydiv{
      font-family: "Inconsolata", monospace;
      word-break: break-all;
      font-size: 3em;
      color: #202020;
      height: 100%;
      width: 100%;
      overflow-y:hidden;
      }

https://jsfiddle.net/4ztpbnm0/1/

It works(ish) on Chrome, but it takes a very noticeable amount of time to reflow after resizing the browser window. Is there any way to make this seamless?