Well that's a genuine problem, we have all faced.
The latest feature in Android 8.1 Oreo introduces speed labels for public Wi-Fi networks. However, for people running their smartphones on Android 8.1 Oreo, that really shouldn't be a problem going forward. On the other hand, on connecting to a network showing "OK" as the speed - users will be able to read web pages, use social media, and stream music. Specifically, the ratings will apply to public networks that can be evaluated.
The Slow speed label shows up if the overall speed is below 1Mbps, OK is for 1 Mbps to 5 Mbps, Fast is for 5 Mbps to 20 Mbps and Very Fast is for Wifi networks with over 20 Mbps speed.
With "Very Fast", you should be able to watch high-definition video from the likes of HBO Now and Netflix; and with "OK", you should be able to do relatively simple internet tasks along the line of checking Facebook and Twitter. However, it should help you make more informed decisions.
The speed label appears right below the name of the Wifi network. The speed ratings are only available on public Wi-Fi networks - private networks (those that require a password) do not display a speed rating since they're, well, private. Look up Wi-Fi Preferences, and then go to Advanced settings. Under "Network rating provider" choose None.
While the network speed is something new coming to Android smartphones, the operating system has always shown network strength in the form of a pie slice. The more bars, or the fuller the icon, the stronger the signal.
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