Disable Reserved Bandwidth

Windows reserves 20% of your bandwidth for QoS traffic, for example Windows Update, streaming videos or audio, Voip applications, etc.. You have an option to disable this reserved bandwidth to get access to 100% of your bandwidth. However, please take note that the 20% reserved bandwidth is only used when QoS applications need it. You always have access to 100% of your bandwidth when these QoS applications are not in use so only disable the 20% reserved bandwidth when it doesn't harm your experience with these applications.

Warning: Disabling the reserved bandwidth might cause problems with applications that use this bandwidth, for example Windows Update, VOIP or streaming video applications.

Disable Reserved bandwidth in Windows 7, Vista and XP

Click on Start in the lower-left corner of your screen and type Regedit in the search box and press Enter on your keyboard
In Regedit click your way through HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows
Right click on the Windows map and select New and Key from the dropdown menu and name the new map Psched
Double-click on the new Psched map and right click in the empty white screen on the right
Select New and DWORD (32-bit) Value from the dropdown menu
Name the new Dword Value NonBestEffortLimit
Right-click on your new NonBestEffortLimit key and select Modify from the dropdown menu
In the Value Data field make sure the value is 0 so the reserved bandwidth percentage is set to 0% (you can change the value to any percentage you want the reserved bandwidth to be, from 0 to 100)
Click OK and restart your PC to make the changes