Tivo Stream Slow, How do I speed up?

I know this general question has been asked but there always seems to be on detail that doesn't match my situation. I have the TiVo Roamio with Tivo stream standalone. I use apple Tivo app on iPad and iPhone. I have comcast with 50mb/s download speed. My iPad averages a speed of 42mb/s. A 1 hour tv show downloading medium size takes about 20mins. Yet I can download Avatar in HD (5.5GB) in the same time (20mins) or less. The Tivo stream is just ridiculously slow is there anyway to speed up? With my connection I should easily be able to download a 1 hour show (medium quality) in 5 mins. Also note I'm downloading on my home network not out of network. How do I make my Tivo stream match my internet speed?