Lots of upload speeds. Lots and lots. Generally speaking, a 2mb+ connection will give you the best results. You'll have to have a matching download connection as well.

Also, it's a matter of preference. Some people prefer really sharp images but not as high frame rate. Some people prefer smooth frame rates but grainier images. It depends on what you are watching. Sports people might want smooth frame rates to see the action. But for a documentary, better stills are more important. If you have lots of upload speeds. You can do both.