Comcast backbone issue (IPv4)? - XFinity

#1
For Comcast backbone issue (IPv4)?, XFinity-Comcast internet. Why is there such a huge discrepency in speed with IPv4 vs IPv6? Seems like a router in Comcast's backbone is having some issues, I can barely browse web pages right now and my latency is like I'm trying to talk to Tokyo.

http://results.speedtest.xfinity.com/result/1403487004.png

IPv4?
IPv6?
Update: Heres the IP of the other Google server, better latency but still massive packet loss (couldn't even complete a DNS lookup):
IPv4?
 

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