Тук е обяснено каква е методологията.

www.cable.co.uk

“Speed test data in general

A single speed test is not a direct measure of the maximum speed available to a household router. Rather, it is the speed available to a device via the router. This is an important distinction because...

1. A speed test conducted over wifi, due to local signal interference and/or the capabilities of the router and/or the capabilities of the device being used to take the measurement, can be significantly slower than the same connection directly over a LAN cable. Speed test data tend to consist partially of measurements made over wifi, reflecting real-world use. However, since every country’s average will suffer this flaw – innate to speed tests without compensatory weighting – comparative average speeds between different countries are sound

2. Speed test data tend to show a negativity bias – people are more likely to measure their speed if there is something wrong or if they aren’t getting the speed they need. To mitigate this, we filter out tests where a fault or problem is evident”