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The tester isn't giving incorrect results it is showing accurately the speed you achieve from the TBB test server.
This has been discussed here and elsewhere countless times - once I too thought that the problem lay with the TBB tester - it doesn't it's the fact that VM run some of their peering links at very high utilisation including, it seems, the one used in your routing to the TBB tester. I've seen TBB speedtests taken from university connections showing over 400Mbps.
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