Dan got a new 802.11n router and when they stream Netflix at night, nobody else can use the internet because it gets too slow. Leo says this is because of his bandwidth. Netflix uses a ton of bandwidth, and after 6pm, over 40% of all internet traffic is Netflix. Dan could use a hard wired connection from the router to his PlayStation, but he only has so much bandwidth. He could pay to get more, but Netflix may just increase the picture quality if it gets more bandwidth and he'd be back to square 1.
That chatroom says this article by eHow can help him improve his quality of service, which gamers use to improve their performance.