A good article from USA today hits thes questions and a couple other tips. Historically, Netflix does the best job with slow internet service and realtime up’s and down’s in speed.
“For starters, Netflix recommends minimum Internet connection speeds of three megabits per second for standard-definition video quality, five Mbps for HD, and 25 Mbps for Ultra HD content.”
“Nothing takes all the excitement out of streaming quite like buffering. When that happens, pull up Fast.com on your phone, tablet, computer or TV. It’s a new site powered by Netflix that shows you how fast (or slow) your connection is in real-time. Although it won’t stop the buffering from happening, it will help you pinpoint what might be causing it.”
See the article at: http://usat.ly/1sRYoed