ie_paint_perf_killers.js

(function() {
  var result = [];
  function isProblematic(style) {
    if (style.overflow !== 'visible') {
      if (style.borderTopLeftRadius !== '0px' || style.borderTopRightRadius !== '0px') {
        return true;
      }
      if (style.borderBottomLeftRadius !== '0px' || style.borderBottomRightRadius !== '0px') {
        return true;
      }
    }
    return false;
  }
  function visitElement(el, parentStyle) {
    var style = window.getComputedStyle(el);
    if (isProblematic(style)) {
      result.push(el);
    }
    for (var i = 0; i < el.children.length; i++) {
      visitElement(el.children[i], style);
    }
  }
  visitElement(window.document.documentElement, {});

  console.log('IE paint performance killers: ' + result.length + ' elements');
  result.forEach(function(el) {
    console.error(el.nodeName + ' id=' + el.id + ' class=' + el.className);
  });
  if (result.length > 0) {
    window.problematic = result;
    console.log('See window.problematic');
  }
})();