networkQuality
does a pretty decent job to measure network speeds.h
dreadnought:fastidious$ networkQuality -s
==== SUMMARY ====
Upload capacity: 530.336 Mbps
Download capacity: 871.282 Mbps
Upload flows: 16
Download flows: 12
Upload Responsiveness: High (2981 RPM)
Download Responsiveness: High (2055 RPM)