If you can't join the Comcast test, you can still do something about bad latency and bufferbloat. You can minimize bufferbloat by using DD-WRT firmware in your home router(many routers supported »
www.myopenrouter.com/ ). You do this using the QOS option in the firmware and setting the max download and upload speeds below the rated speed of your internet service. You give up some speed, but get better latency for gamers and for browsing.
Router Name DD-WRT
Router Model Netgear R7000
Firmware Version DD-WRT v24-sp2 (07/01/15) std - build 27261
Kernel Version Linux 3.10.60-rc1 #1 SMP Tue Jun 30 18:03:06 IST 2015 armv7l
An example of bufferbloat test using DD-WRT firmware turned on:»
[Cable Speed test: 116.02/10.34 16 ms]QOS options used for the Bufferbloat test above: