Official speedtest-cli program under Debian 10, Ubuntu 18 is a broken product based on old python2. It will show you correct download speed result. It will show you INCORRECT upload speed result averaging 4 mbps. With an official Speedtest CLI https://www.speedtest.net/apps/cli you will get the real result. Example of speedtest with official speedtest cli. Server: Milan (id = 1434) Latency: 0.44 ms (0.08 ms jitter) Download: 735.95 Mbps Upload: 935.67 Mbps Packet Loss: 0.0%