I´m Daniel and we recently looked at various speed metrics and related page characteristics, using the HTTPArchive and the CrUx datasets. While most of the results might be familiar to you, we also run a machine learning model to determine the most important page characteristics that influence page speed.
The final piece can be seen here: https://backlinko.com/page-speed-stats. The more technical paper can be found here: https://frontpagedata.com/projects/backlinko/pagespeed/Analysis_final.html
I would also like to thank the community and the HTTPArchive-Team, especially Rick - without the excellent resources on GitHub, the forum and elsewhere, we wouldn´t be able to conduct the study.
Would be curious to know what you think of the results.