Odd results on Speedtest

I have windows 7 home premium with firefox as a browser and KIS and MBAM Pro for security. I have used speed test.net in the past and ran smooth until a few months ago. When it runs the first test it only hovers around 4 or 5 mbps then shoots to 2000 to 3000 and moves on to the next test which seems to run ok. Anyone know what may be causing this or have the same experience? I use comcast by the way as my ISP. Thanks

 

is KIS set to monitor web browsing? If yes maybe that is causing the spike

 

I have the web AV turned on but the plug in for the url checker is disabled as of yesterday. The last test was about a week ago.

 

The "Comcast HSI" forum on DSLreports.com (possibly more generally known as broadbandreports.com ) has quite a lot of good info about various speedtests and their relevance for Comcast users. There are often posts about "traffic shaping" and how that affects speedtest results.

 

Thanks for the link, I'll have to take a look. After the other guy mentioned the kaspersky setting though, I am starting to think it was around that time that this all started. It was after I installed it at some point when the test started acting up. Although I am less than impressed with my IP providers, I have no options yet to switch to a different one at the moment. I'll look at the link and see what it says. Thanks again