Another bit of good news - guidosarducci over at OpenWrt has packaged up an improved version of the "betterspeedtest.sh" script to work with OpenWrt 18.06.

https://forum.openwrt.org/t/speedtest-new-package-to-measure-network-performance/24647/71 shows the announcement of the package. Run it with:

speedtest-netperf.sh --help

Enjoy!

Rich