Although the speed achieved may match expectation for the connection, a low data flow QoS score means that the data flow between the server and the workstation was not consistent. There can be several reasons for this such as data congestion along the route or data loss which invokes recovery. The lower the QoS percentage, the more erratic the data flow. Many applications can be severely affected by poor data flow quality regardless of data throughput speed, for example media applications such as video or voice may become jerky. Voice (VoIP) telephony will become garbled. If you suspect that the connection was in use by another application try running the test again to validate if the problem is persistent.
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