title: webdriver click event is slow with firefox
body: <p>I'm using <code>ruby 1.8.7</code> and <code>watir-webdriver 0.6.1</code>, and found that following script is very slow when click some link element under <code>windows 2003/2008 server</code>, but the same script is fast under <code>win7</code> and <code>windows2008 R2</code>:  </p>
  
  <pre><code>log "try table menuitem, sub_menu_area=#{@sub_menu_area.inspect}"
  link=@sub_menu_area.link(:text =&gt; name, :class =&gt; "SGLeftPanelText")  
  log link.inspect  
  link.fire_event("onclick")   
  log "menu link clicked." 
  </code></pre>
  
  <p>and the log shows:
      <pre>I, [2012-12-22T01:02:46.944250 #5672]  INFO -- : Info: sub_menu_area=#"td", :id=>"tables_cell"}><br>
  I, [2012-12-22T01:02:46.944250 #5672]  INFO -- : Info: try table menuitem, sub_menu_area=#"td", :id=>"tables_cell"}><br>
  I, [2012-12-22T01:02:46.944250 #5672]  INFO -- : Info: #"SGLeftPanelText", :tag_name=>"a", :text=>"Support Cases"}><br>
  I, [2012-12-22T01:03:03.100500 #5672]  INFO -- : Info: menu link clicked.<br>
  </pre>    </p>
  
  <p>From the log, the click event takes <code>16 secs</code>, but on another machine with <code>win7</code>, it only takes <code>2 secs</code>, can anybody give me some suggestion?</p>