Update: it has been pointed out that the speedtest.net system defaults to testing with multiple download connections at the same time, so in order to try for an "apples vs apples" comparison, I recommend switching to "single" using the button in the pic below.You could also try https://www.speedtest.net/ and use the "Change Server" button to perform a test via i3D's Rotterdam site (see pic) to see how it does - that might shed light on the issue.
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Anyone who gets good download speeds from the i3D Rotterdam speedtest.net server with this test, but yet gets poor download speeds from RD: please let us know so that we can investigate (and get the i3D team involved).
(You're welcome to speak up either way of course; e.g. we're interested to hear from people who get poor download speeds from that speedtest.net server but good speeds from other servers in the same part of the world, even if our chances of influencing things are much reduced.)