I have 65mb down and I don't have any trouble at all. I think you only need 12mb to stream their highest quality. That could be a complicated answer. It may be your router, or wireless device. That's where you should start looking. Contact Comcast and have them help you trouble shoot. I know my provider has that service.

Probably Hulu. Netflix and YouTube actually have servers placed in local Internet Provider offices & have the most popular movies and videos predownloaded. Plus, your signal doesn't have to travel far. Hulu does not have that. However, it could also be your service. For me, it was both. Speed test.net will tell you what your speed is. Hardwired should be the speed you pay for. Wireless is always less, usually, by about 25% but sometimes more depending on your devices and interference.

It's hulu I hated them and canceled I got Netflix I love it and joined the Netflix DVD movies for $17
And love it muy problem with hulu was freezing yup issues and lots off buffering