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The upload speed test currently doesn't show a "TiP" graph of the speed over time like the download test does. The curve of this graph could allow one to determine the presence and effectiveness of an advanced congestion control algorithm (ctcp, cubic). I would also like a precise readout of the Initial Congestion Window, which is essentially the first data point of the graph. This parameter is now configurable in modern OS, but it can be difficult to tell if the tweak has been correctly applied. In my opinion the upload graph is more useful, because in the opposite direction a TestMy server is always capable of uploading fast, while much more variety exists in residential connections and operating systems. Although my browser does show the current upload speed of standard HTTP posts, the reading doesn't have good enough resolution.

@PacificAgRentals I'll take an educated guess and claim the test you link to is a flash based test, which by default in my opinion and experience is flawed from the start. Secondly, the specific test linked, is likely hosted on xfinities top tier pipe. In other words, the test is likely running within the ISP's systems, a direct connection from you to them. And could also be running on a low traffic port such as 8080 Not a real world test, yet a simple test to prove the ISP is able to make a connection to your modem, and the boot file is supplying the throughput it is set to. Testmy.net runs on port 80 (by default) , which is again , the default 'web port' or which is historically the edge port which all website traffic run on. Different test servers can be used to analyze different location to / from the test point. ISP peering, or connectivity over and through backbones is organic, and natural. In other words, testmy.net will give you real world results as loading a webpage from any site in the location would.

Thinking along the lines of testing various geographical locations automatically. Or, an auto test feature. With the default option to query each available test server; Or via test server selection.