I feel the need for speed
There are a few things to note when conducting any bandwidth speed test:
The results of your test are affected by the amount of competing traffic concurrently running on your network.
To obtain more accurate results from your speed test, do not initiate the test until you know there is little or no traffic from other users or devices on your network. For best results, connect only a single PC to your router and run the test. This removes any possible points of congestion on your LAN from the testing environment.
Because some bandwidth is required to transport test data across the network, your results may be approximately 10% less than your actual subscribed speed.
If your speed test is considerably less than what you expected, this could be an indication of unknown or faulty equipment running on your network.