Well it would seem that your slow download is based on your slow speed provided by your ISP. I can download an iTunes movie on avergae 45min, and downloaded a movie via the itunes app and it took just under and hr. Perhaps getting a better ISP would be best. You average 1.5mb down. Where I have an avaergae of 10.5mb so obviously my downloads would be faster! Good luck!
EDIT: Regarding file size, theyre large because for those like me who watch them via dock, or my Apple TV so they can output all pretty and stuff, I assume
