Windows 10 Myth: Don’t Touch “Limit Reservable Bandwidth” Here’s an old PC myth that just won’t die: Did you know that your Windows PC only uses 80% of its available network bandwidth by default? You can speed up all your downloads by changing a setting in the Registry or Group Policy! Well, no. That’s not how it works. How Windows 10’s QoS Packet Scheduler Works This setting has existed since Windows XP, so this bad Windows tweaking tip has now been going around for 20 years. Windows 10 has a feature called the “QoS Packet Scheduler.” It’s found in all versions of Windows, starting with Windows XP. QoS stands for “Quality of Service.” It’s a way of prioritizing certain types of network traffic, which is made up of packets.