Verizon and Netflix both make statements saying they are not to blame for the buffering users experience when accessing Netflix from a Verizon connection. Verizon’s blog post says the slowdown is caused by the fact that Netflix does not negotiate with them about how to manage the large amount of traffic it sends to Verizon’s network:
Netflix is responsible for either using connections that can carry the volume of traffic it is sending, or working out arrangements with its suppliers so they can handle the volumes.
A Netflix spokesperson responds in a statement to The Verge that it is Verizon’s responsibility to upgrade its connections so they can handle the traffic:
Congestion at the interconnection point is controlled by ISPs like Verizon. When Verizon fails to upgrade those interconnections, consumers get a lousy experience despite paying for more than enough bandwidth to enjoy high-quality Netflix video.