Thanks for reaching out to us in the land of the forums.
The main reason for this behavior is the connection speed. If the connection speed on both ends (Slingbox location and your current remote location) is not good enough, the signal will be affected. The following links will provide you with some information that might help you.
A slow Internet connection at home can affect picture quality
Network speed requirements for SlingPlayer Mobile for iPad
The Slingbox Moderation Team
Yes I am aware of the Internet upload/download speed requirements. I have Uverse at home with upload speeds in excess of 2-5mps so there is no issue there. I tested my download speed at the hotel to be in the range of 5-6mps and still had the buffering issues even in Standard Quality. A search on the forum reveals others with the same issue. Is there a fix when a computer will view just fine but the iPad will not in the same environment when the connection speed on both ends is well above the minimum required?
Thanks for contacting us back. We do apologize that you are still having issues with the buffering. Again the main cause for this is due to lack of speed either on your home network or the network that is being used. (Just to inform you if you are staying in a hotel, please be advised that many people are trying to use the Internet at the same time, and that can very well bog down the usage and the speed). Try taking the iPad to another Wi-Fi spot to test this out.
We have included another link that may be of use. Of course this is for Android Players, but the concept is quite the same for an iPad.
Troubleshooting SlingPlayer for Android Tablets video quality issues
The Slingbox Moderation Team.