After using my Windows XP Pro for almost 8 years, today I found this. And it works also with Windows 7 (tomorrow I'll know if it works with 8.1), because the frame of all Windows OS is the same since NT, and gpedit.msc is still there:
WINDOWS XP PRO GOBBLING UP YOUR BANDWIDTH
The jury is still out on this tweak for speeding up the Internet connection in Windows XP PRO. I'm making no claims for it but it's easy to do, and undo so see what you think….
The premise of the tip is that XP Pro (sorry XP Home users it doesn't work for you…) is configured to reserve 20 percent of your available bandwidth for Windows housekeeping activities, downloading updates and so on. There's some debate as to whether this is true or not but XP itself claims it to be the case. To check for yourself go to Run on the Start menu and type 'gpedit.msc' (without the quotes) and this opens the Group Policy Editor dialogue. Now work your way to Local Computer Policy > Computer Configuration > Administrative Templates > Network and double click QOS Packet Scheduler. In the right hand pane click on Limit Reservable Bandwidth and a brief explanation of what it does will appear. To make the change right-click on Limit Reservable Bandwidth, click Properties then the Enabled button and set the Bandwidth Limit to zero, Exit the box, reboot and give it a try.
Try it. The outcome is amazing. At least, to me it was. 20% of bandwidth not available is no bullshit, if your ADSL is not a blitzkrieg.
If you liked this hint, please send me the telephone number of your girlfriend's sister.