title: Slow/bad performance on Chrome with large amount of html
body: <p>When testing all the browsers with TinyMCE 4, Chrome is horribly slow.
  (I tried removing all the plugins from TinyMCE but it makes no difference.)</p>
  
  <p>Chrome takes about 20-25 seconds to render some HTML in TinyMCE that contains a few large-ish (500kb) embedded base64 images.</p>
  
  <p>Internet Explorer and Firefox take about 1 second and Edge is instant.
  (Edge is pretty damn fast!)</p>
  
  <p>All plugins have been disabled on Chrome.
  I have looked at the timeline under F12 and nothing is holding it up. According to the F12 timeline, everything was processed in 800ms - Yet it still takes 20 seconds to show up?</p>
  
  <p>The delay is only when TinyMCE contains embedded base64 images.</p>
  
  <p>Has anyone experienced similar behavior?</p>
  
  <p><strong>Update:</strong></p>
  
  <p>I have noticed that even when I open large documents in Chrome, its loads a lot slower than the other browsers. You can actually watch as the scrolling bar gets smaller and smaller as Chrome loads the document.</p>
  
  <p>In other browsers, such as Edge, the whole page is loaded instantly.</p>