Videos are extremely slow when trying to view them

Here is the situation. I have been posting course material for over a year now, and everything had been working fine. Over the last week, any video that I try to view from our iTunes U site is taking at least 5 minutes to play, when I double click on the video I get the loading bar, the videos that are less than 30 minutes long take between 5 - 8 minutes to play, the ones that are over 30 minutes take between 10 - 15 minutes to play. This had never happened before, and the weird thing is that I can go to any other iTunes U site and view videos that are two hours long and it takes less than a minute to play. So I know its not my network bandwidth or I wouldn't be able to view other sites. I use an iMac with a 2.8 GHz Intel Core 2 Duo, 4 GB of Ram, bought specifically for iTunes U administration. I don't know what else to do. Any help or advice will be truly appreciated.
Ernesto
Oklahoma City University

I have also found our iTunes U site extremely slow for the past few weeks. It also took a long, long time to log into Admin. But at least for us, there has been a noticeable change (for the better) in the last few days.

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