Question : Cable Internet Speed - Speedtst.net 8Mbps / Actual < 1Mbps  Why?

I have just switched to Comcast Workplace Extended Internet.  When I use speedtst.net the speeds are 6Mpbs and up.  My problem is when I download files from say Adobe or other websites the download speed is mostly 1Mbps or slower.  I am using Windows XP Pro, I built my computer is has a core2 extreme 2.66Mhz processor with 3Gb or RAM.  The motherboard is an Asus P5W64.  We have a Gigabit network with Netgear Gigabit switches.  Currently I have a NetGear FR114P Router that I will be replacing next week with a WatchGuard Firebox Edge X20e

My question is am I missing a setting somewhere in Windows or the Router.  MTU is set for 1500.  We have a static IP address and the router serves as a DHCP server since we have a peer to peer network.

Answer : Cable Internet Speed - Speedtst.net 8Mbps / Actual < 1Mbps  Why?

http://www.speedguide.net/downloads.php

use that to test what your mtu should be

Also its not just your broadband but the server that is sending the files are also being slow due to multiple downloads etc