Windows 7, Vista and XP reserves 20% of your bandwidth for Quality of Service (QoS) traffic, for example streaming audio or videos, VOIP applications, Windows Update, etc. You have an option to remove the limit of reserved bandwidth to get an access to the full bandwidth. Although, please mind that the 20% of the reserved bandwidth is only used when Quality of Service applications need it. When these QoS applications are not being used, you always have an access to your full bandwidth, so disable the 20% reserved bandwidth only it does not harm your experience with those applications.
Be aware: disabling the reserved bandwidth may cause problems with the applications that use that bandwidth, for instance VOIP, streaming video applications or Windows Update.
Click on ‘Start‘ → in the search field type ‘regedit‘ and press Enter → Click your way through HKEY_LOCAL_MACHINE → Software → Policies → Microsoft → Windows.
Right-click on the Windows map and select New → Key from the dropdown and name it Psched
Double-click on the newly created Psched map and then right-click on the empty white screen and select New → DWORD (32-bit) Value. Name it NonBestEffortLimit
Right-click on the created NonBestEffortLimit key → Modify. Make sure the value in the Value data field is set to 0 hence the reserved bandwidth percentage is 0%. Click OK and restart your computer to apply the changes.
This tip helps to increase the bandwidth using NordVPN as well. Please mind that a slower bandwidth means slower internet speed with VPN.