try this one. http://www.speakeasy.net/speedtest/ Pick the Dallas server.
But remember this. If your modem is the older style using the DOCSYS 1.x protocol, the newer DOCSYS 2.0 is optimized for Comcast. You will get above 6 Mb/s with the new protocol. You need to look at your modem. If it's DOCSYS 1.x you need a new modem that supports 2.0.
My Comcast connection went from 3 to 6 Mb/s when I replaced the modem.
I have used this bandwidth meter consistently for the past years. The Houston area has been changed from Time Warner/Roadrunner to Comcast. Roadrunner ALWAYS measured 3600-3800; as soon as the Comcast change went into effect, the measured speed has dropped to 2200-2500. I can also see decreased speed in downloading pages etc. I've had Comcast out to troubleshoot and they suggest the CNET bandwidth meter may have moved the server to a different location at a time coinciding with the drop in measured speed.
Can you answer if there was a change in the bandwidth meter around April to May 2007 or since? Am I wrong in thinking that using the same meter should offer me an apples to apples comparison? The Comcast service tech uses a different meter that produces 12,000 reponse and they proclaim me crazy for not being happy with the speed.
Any info is appreciated. Marshall