Replace is/is2 with i.4cdn.org on 4chan

// ==UserScript==
// @name        Replace is/is2 with i.4cdn.org
// @namespace   boards.4chan.org
// @include     *boards.4chan.org*
// @description Replaces slow new links with fast old ones
// @version     1
// @grant       none
// ==/UserScript==

function replaceLinks () {
  var aTags = document.getElementsByTagName('a');

  for (i = 0; i < aTags.length; i++) {
      if (aTags[i].href.includes('is2.4chan.org')) aTags[i].href = aTags[i].href.replace('is2.4chan.org', 'i.4cdn.org');
      if (aTags[i].href.includes('is.4chan.org')) aTags[i].href = aTags[i].href.replace('is.4chan.org', 'i.4cdn.org');
  }
  setTimeout(replaceLinks, 500);
}

replaceLinks();