I used WinMTR program to traceroute.
I tried with any websites and game servers, and no matter what I get more than 70%+ packet loss every time.
http://imgur.com/IPXWc7h (google dns server)
http://imgur.com/PFnAJNb ( Riot NA game server)
Could you fix this quick Comcast?
I tried everything (unplug,turn off/on,,,etc)
--------
update: my router was the problem.