Netflix is so slow!! Why?

We just got netflix. We used the wii first, it took like 30 min just to stream and TV show and during a movie it "Retrieved" like 5 times. Its annoying!! So we switched to our Xbox 360, but it didn't help. It says our internet connection is too slow. It only shows ONE bar. The router is only like 6 feet away from the wii and xbox so thats not it. Our computer is pretty fast though..so i don't know what the problem is??? PLease help!? Do we need to two wireless routers for it to work fast??