for example here is a list of speed test conducted by spdmerlin
View attachment 22454
here is an example speed test done on ookla from a client,
View attachment 22455
From the spdMerlin OP:
spdMerlin uses SpeedTest CLI
If the speeds from this utility are significantly lower than those you see from the desktop app/browser test, the limiting factor will be your router's CPU. That being said, there is probably room for improvement/optimisation by the Ookla team in the CLI binary itself. Please direct feedback about speed issues to Ookla via the above link. There is nothing that I can do about them.
https://www.snbforums.com/threads/spdmerlin-automated-speedtests-with-graphs.55904/