Can't stream movies - DirecTV

I have Uverse Internet and phone and Directv and my internet speed i'm paying for is supposed to be 18mbps down. Everytime i try to stream movies on Directv it tells me my speed doesn't meet the minimum required speed of 2 mbps to stream movies and that i will have to download the movie first before i can watch it. why is that??

This question, "Can't stream movies," is about DirecTV channels, programming, equipment, and sports.