The folks in the forums at dslreports.com are generally on top of this like a hawk and are probably a better resource than here. For what its worth, Comcast often provides temporary speed enhancements for the first so many bytes in x seconds, ("powerboost"), which can often throw off short flash-based speedtests. On Mon, Feb 4, 2013 at 11:09 PM, Ishmael Rufus <sakamura@gmail.com> wrote:

Could someone help verify the listed speeds for the different services for Comcast:

Performance - 20mbps (Customer support is claiming it's now 15mbps) Blast - 30 mbps (Customer support is claiming it's now 20 mbps)

I was getting 20+ download speed tests on Performance which is correct. When I told customer support I was getting half (because of packet loss) they brought this other information to my attention