I'm allergic to videos as replacement of data, but does your video substantially differ from what tests give us, e.g. http://www.webpagetest.org/video/view.php?id=160118_YK_HKT.1.0 ?
It's easy to test multiple speeds (some tests still pending): http://www.webpagetest.org/video/compare.php?tests=160118_AZ_JH3,160118_VB_J...
Some of the tests show significant CPU usage after the "everything and a kitchen sink" ResourceLoader phase in which some stuff for CentralNotice, Gather etc. etc. is loaded.
Mainly, the issue is to pick representative connections. There is some official data, some of which based on actual tests by probes, although it's limited: * https://ec.europa.eu/digital-agenda/en/news/quality-broadband-services-eu (no mobile) * https://ec.europa.eu/digital-agenda/en/news/use-commercial-mobile-networks-a... (needs some parsing!)
Nemo