Yes, and, the joke in the industry is that network speed tests are to network performance what the Volkswagen Diesel was to emission tests :).All carriers implement various types of throttling or rate limiting, for a lot of reasons (anti-ddos, cost control, etc.)
But; universally, they bypass these rate controls such as Cisco PGW ADC (Application Detection and Control) and LTE eNB ABR for wireless as examples, and many others similar features that limit the rate the user actually gets. And in almost all cases, these systems are designed to allow speed tests to bypass the rate limiting.
Commercial Speed tests are in no way a valid or reliable way of understanding the quality of a network service. I am a little surprised that this is breaking news on HN however. I would think this would be pretty well understood by this community?
BTW. Fast.com does is not always immune to this "Volkswagen diesel" effect. The only way to know for sure is to have a VM or bare metal server someplace and do an iperf to it.
Monday, April 18, 2022
Your internet might be slower than expected, except when you test the speed.
Ask HN: Internet magically gets faster when opening speedtest? | Hacker News
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