You didn't provide any new information in your second posting. Therefore I can only repeat myself:
If you still suspect this is a performance issue, then:
>> Could you provide the other background information mentioned in the introduction to this forum? I mean the hardware - real or virtual.
Or, if you think the theme is the problem:
>> Did you try changing to simple standard theme? You have to follow up that line in the "Themes" forum http://moodle.org/mod/forum/view.php?id=46.