Remember, there are a couple of factors that can affect the results from the speed test sites.
- Traffic on your home network. If you (or someone sharing your home network) are downloading a bunch of stuff when you run the test, you are already using some of your capacilty, and your results will be lower than if the speed test were the only connection running at the time.
- Load on the test server's network connection. If the server you are connecting to is on a slow network, or if it is really busy, you might get slow test results. So, try several different servers, and look for the higher results.