Slow SourceOne message preview

Hi everyone,

We recently implemented S1 in our environment and so far everything appears to be working fine, however there is one annoyance that I can't seem to pinpoint the cause.  When previewing messages that were queried via the S1 web search, some if not most emails take in upwards of 30 seconds to display the contents of the email in the preview pane. For example I would conduct a search for some email messages; S1 returns the list of messages, then when I select one of the email messages to preview, my browser (Internet Explorer 8 or Firefox) would sit there stating at the bottom of the browser "Waiting for archive.mycompany.com/preview.aspx.....", and after 20+ seconds the contents of the message finally appear.  Yet if I select to view a different message, certain ones will display within a 1 - 2 seconds.  By the way, this even happens to messages that have been shortcut by S1 and previewed via Outlook 2010 client with the Offline Cache plugin installed.

Anyone have any ideas why it does this or how this can be fixed?  I have even looked at the DocManageService.log in S1 and I can see this 20 second delay recorded.