I use sqm-scripts for a variety of purposes to insert delay or other variables like aqm and fq technologies.

I also wrote a now somewhat out of date cautionary note about all the pitfalls you can land into here: https://www.bufferbloat.net/projects/codel/wiki/Best_practic...

And over here, while we convinced systemd to adopt fq_codel by default, I cautioned against drawing conclusions from within the box simulations verses the general internet's behaviors: https://github.com/systemd/systemd/issues/9725#issuecomment-...

I am perversely glad measuring this stuff irks so many other people besides me!