You wouldn't happen to have a Killer Network chipset, would you? There has been a bug in it for a long time (since Windows 8, at least) that causes it to gobble

You wouldn't happen to have a Killer Network chipset, would you? There has been a bug in it for a long time (since Windows 8, at least) that causes it to gobble up memory in a particularly frustrating way because the utilization doesn't show up in Task Manager. Installing the latest version of the Killer Networking driver fixes it [1]. You can also prevent the bug by disabling the Windows Network Data Usage Monitoring Driver by changing the registry key HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Ndu to "4" (disabling it). 1. http://www.killernetworking.com/support/driver-downloads http://www.killernetworking.com/support/driver-downloads