I also assert that this "fix" does not work as described. The bandwidth allocation for QoS services are only set aside when the network is set up to make use of it. And the purpose of this is actually to improve your performance in most situations even when it is enabled. Unless you're playing on a network with QoS services enabled, then the bandwidth is not touched.

Also consider that you are talking about 20% of the bandwidth of the NIC, not your internet connection, as broadband connections are usually managed by a separate modem or on a host server and not directly inside by your PC. Typical NIC speeds are 10/100 Mbps. Let's assume you are only connected at 10 Mbps. A broadband connection is somewhere between 256 Kbps and 1.5 Mbps. So you're telling me that shaving 2 Mbps off the NIC speed has a significant effect on about .5 Mbps of the remaining 8 Mbps that is largely unused as well? And this is for high-end connection speeds.

The other possibility is that you are playing over dial-up with the modem in your gaming machine, in which case there is no NIC to manage. Besides the fact that QoS should now be disabled and no allocation taking place, the limitations you experience have more to do with connection speed, line quality, and service provider than anything else.

Best case scenario is you are inadvertently disabling other features in your system that may be related to IP management, causing some other unknown affect on system performances. Maybe you boosted IP traffic somehow, but at the cost of what else? I need specifics of what I just disabled in my machine before I start blindly disabling services. Maybe I'm just paranoid....