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I read the guide explaining why speedtest.net reports higher speeds than testmy.net. http://www.speedtest.net/my-result/3962390815 vs https://testmy.net/db/OPnq5Eg(multithread) That's over 3x the difference. That seems to be more than the existing explanations can justify.

Considering you are located in the UK, I would recommend you use the London server. (Mostly because the large majority of .uk sites are located within the UK, so it represents the typical speed from you to them.) Other than that, the choice really doesn't matter except to change what routing paths are used and such. If you manually decide to select the San Jose server, you will likely choose a significantly different route than if you were to select the Dallas server, or the Washington D.C. server. Thanks, EBrown

The difference of the two you say? Speedtest.net uses a pure flash-based approach, and drops the top and bottom 5% of your tested speed. Why? Because the first instant of testing is typically slower due to the requirement to establish a connection. Then there's often a sudden burst which is typically irrelevant to your speed. Speedtest.net is more useful for a total-throughput test. It's often handy for gamers to test what the typical speed of their connection is. (After all, they are using UDP mostly which is connectionless, so there is no establishment of a connection.) Testmy.net uses a pure HTTP based approach, and does not remove any data. Why? Because almost all of the typical users network traffic is over HTTP, which requires the establishment of a connection. (Downloads, webpages, style-sheets, images, etc.) Testmy.net is much more relevant to testing your total connection throughput. Basically giving you a true establishment of how websites should download. Thanks, EBrown