maybe your hoster changed something which now affects the slider? Try to contact them and ask them for error logs, etc.
It seems like the problem is caused by the dynamic xml file: rochesterhillsdentistry.net/wp-content/themes/display/slideshow/dont_edit.php
Your case reminds me to: http://www.kriesi.at/support/topic/very-slow-loading-time#post-4931
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