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That test was totally inaccurate for me. It got the download right but upload was only 1/12 of my rated speed and 1/12 of what all the other tests (and my actual experience) tell me.

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Same for me. The download speed was fine, but upload speed was 1.75x the actual one.

Same for me: download was okay, upload was completely wrong

My very limited experience in this space is that measuring uploads is actually quite a bit trickier and harder to nail down than download speeds

Perhaps you can audit the https://github.com/openspeedtest/Speed-Test codebase

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