Another good way of looking at the problem is that you need to test latency under load, not latency on an otherwise-idle network. Ping tests on an idle network

Another good way of looking at the problem is that you need to test latency under load, not latency on an otherwise-idle network. Ping tests on an idle network only tell you the best-case latency. If you try doing that a while couple of devices are running video streams (especially if it's two-way from videoconferencing rather than Netflix), you get a very different picture of your network's performance.