pagespeed - what kind of result of Google API Pagespeedonline response? -


i don't know how google figure out(calculated) size of different request file website(css, js, html) had checked , compare result tool pingdom, gtmetrix... it's not right!

this result:

https://www.googleapis.com/pagespeedonline/v2/runpagespeed?url=https://stackoverflow.com/&callback=runpagespeedcallbacksmb&strategy=mobile&key=aizasyaefsjzhaicorvhxzd9be015_hxidruc_u tool pingdom: https://tools.pingdom.com/#!/egbivw/https://stackoverflow.com

enter image description here


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