Right, beenm searching around for solutions to this stuttering issue (the one shown in this video is similar - http://www.youtube.com/watch?v=t8avJ2X3d2Q )

So far the so called solutions I have found and tried are

Disable gamepad via config
Uninstalled Avast
Checked and ensured I have no Infrared devices
Checked and ensured I don't have Virtualbox
Disabled all Human Input devices
Setting it to one CPU core
Complete uninstall/reinstall
Opened the required network ports
Disabled my firewall

And yet the problem persists. Can someone please help me figure out what the hell I've missed?