Internet Speed and Comcast Issue

You are very much at the mercy of the speed of the server you are downloading from and the connections in between.

You don't mention is you are using wireless but this will slash your speeds -- even if correctly set up and dramatically if there are reception or interference issues.

To test real speed connect your computer directly to modem and try some large downloads (maybe a Linux release) several times at different times of day and average the file size download time.

If speeds vary wildly at different times of day, the loop you are on in Comcasts's network may be being affected by neighbours using TV etc at peak times.

I have sudden link cable and right now I am downloading files at a rate of 15-35kbs. I am pretty much ready to yank my hair out... Sad thing is they were just here yesterday to fix it. When they left I downloaded a game off steam, and received 975kbs-2.1mbs DL connection, but today its basically not doing zip. I pay the fastest internet speed they offer, but I am getting worse connection speeds then when I had 56k.

For this problem, contact the Internet service provider,
After that check your internet speed, through this site http://www.ip-details.com/internet-speed-test/
It provides the best results for speed test and also has the details about to Search and find ip address's,domain name host's who is information including city, country, global latitude & longitude coordinates.