Here is another fun one 
‘Page Load’/‘Document Complete’ seems to be firing WAY too soon - the page is still loading images.
For comparison here is the exact same website loaded in a Chrome browser running Android emulation that has a MUCH saner view of when Page Load/Document Complete actually is - after all resources have been loaded.
I have run the above tests many times and it’s very consistent and very repeatable: Chrome Android fires Page Load in the middle of loading images while Chrome desktop (emulation and not emulation) fires the event at the seemingly ‘right’ time.
Thoughts???
Thanks!!! Mark