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 My ipad has about 20 ms latency on this site on safari (testing in same country) when on wifi or LAN cable https://testmy.net/latency?addr=de
and 
my thinkpad T480s has a latency of about 70 ms (wifi or wired) on firefox... and on chromium and edge ..... so what is the hardware cause ? what does apple do better ? Is my test meaningful? 
 I have  t480 too. What Os?