Run in elevated command prompt:
netsh interface tcp set global ecncapability=disabled
netsh interface tcp set global congestionprovider=none
http://forums.elderscrollsonline.com/discussion/97277/enable-ctcp-and-ecn-in-windows-may-reduce-latency-in-some-online-applications
Window 2012/8+ Commands
This command will error out. "netsh interface tcp set global congestionprovider=none"
The congestionprovider parameter can be set using the 'netsh int tcp set supplemental' command. The parameter is incorrect.
Try these...
set supplemental congestionprovider=none
netsh int tcp show global
