Yes, I know enough about speed tests to understand where TDS is coming from when they rely on Verizon for checking their Internet connection speeds.
Speed tests are fickle and subject to many variables — server speed and distance to the server being key among these.
If the server (i.e., computer), at the other end, being used for the speed test is slow (or congested) you are going to get slower results because the server is not pumping the data fast enough. Even worse on upload testing. Then there is the distance involved. Further the distance, the slower the results are going to be.
‘Speedtest.net‘, the original gold standard, now, invariably, tends to be on the slow side by 200Mbps (or more). It, as such, is only of use for comparisons.
I use ‘Fast.com‘ often. It is roughly in the right ballpark.
Verizon’s speed test was new to I, but I can understand why TDS likes it. It, more often than not, gives you the highest reading.
So, if you are looking for an Internet speed test you now have the scoop. Hope that helped.