chrome

            $(function(){

                var num = 100;
                var test_count = 10000;

                for(var i = 0; i < num; i++) {
                    $('body').append('<div class="c'+i+'" id="i'+i+'" role="r'+i+'" data-attr="a'+i+'">'+i+'</div>');
                }
                
                var randoms = [];

chrome

jQuery.expr.match['ROLE'] = /\$((?:[\w\u00c0-\uFFFF\-]|\\.)+)/;

jQuery.expr.preFilter['ROLE'] = function( match, curLoop, inplace, result, not, isXML ) {
  match = " " + match[1] + " ";
  return match;
}

jQuery.expr.filter['ROLE'] = function( elem, match ) {
  return (" " + elem.getAttribute('role') + " ").indexOf( match ) > -1;
}

chrome

class BudgetItemsController < InheritedResources::Base
  load_and_authorize_resource
  respond_to :html, :json

  before_filter :get_statistics, :only => [:index]
  layout 'application', :except => [:edit, :update, :create]
  
  def index
    @new_budget_item = BudgetItem.new
    super