I suggest you try disabling the plugin that has that, you can disable them one by one in the admin cp until you find that misc.php?show=ccbmessages isn't working anymore.
Or in general, remove misc.php, if it's not seeming to be used.
I found that it was linked to the chatbox.
I am still running at 5% load. I guess I am going to have to go the semi dedicated route.