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by r1ch 2215 days ago
speedtest.net (and I expect quite a few other speed tests) will open many connections to overcome slowness caused by TCP (low max window sizes and slow scaling). This is likely where the download discrepancy is coming from.

Personally I prefer the single TCP connection results as these tell me what I'm likely to see in a real-world situation such as web browsing with HTTP/2 or a large download.