Note from 10 June 2020
Nice new #WebPerf tool from @browserstack, it will help show people (aka "clients") not everyone have the same high end device and/or browser.
For example, even on the same Windows 10, Edge 80 is 3 times faster than Edge 18:
https://www.browserstack.com/speedlab/report/bb7303c6b142638557f3cde4415cfea8592a9ae9
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older note:
Note from 1 June 2020 -
newer note:
Note from 12 June 2020