My desktop (HP Pavilion 500-047cb) has been getting very slow internet speed with the wired network adapter. Today, when installing a wireless network adapter the same symptoms appeared on the new adapter (NetGear A6210. So, I began researching the issue and noticed what appears to be a QoS bug. Some details on the system are below.
When I boot using the Netgear adapter with QoS (for Netgear) set to "on" and then turn "off" QoS then I am able to get a download speed of 30Mb. Please see the screen shots below. If I boot with QoS "on" or boot with QoS "off" then the network speed is dramatically slower (as shown in the 3rd screen shot). This "boost to expected bandwidth" is repeatable.
It may be possible to produce the same result with the Nic on the motherboard. However, I haven't had time to test. Any solutions are welcomed. Thanks.