Although Android 8.1 has been out for a few weeks now, Google interestingly hasn't stopped adding new features to its latest software release. Case in point: speed labels for public (open) Wi-Fi networks. This functionality has started rolling out today. Once you get it, you will see an estimation of how fast each nearby public Wi-Fi network is, as portrayed in the screenshot to the left. The levels are Very Fast (20+ Mbps), Fast (5-20Mbps), OK (1-5Mbps), and Slow (0-1Mbps). These labels should help you quickly decide whether it's worth connecting to such a network, hopefully saving...
Source: https://www.gsmarena.com/android_81_now_shows_you_how_fast_public_wifi_networks_are-news-29265.php