interesting but i already tried directly to modem without any router and it was the same.(btw the number of seconds almost never varies except when Bungie has problems or maintenance, otherwise it's always the same and both connection aren't from the same internet provider) . Another question i had is if its just normal or it should never take this long with a good connection

It has to be security on the provider side if you are straight into to modem with same hardware. You could call the provider with the slow connection times and see if they can do/open anything. Have you tried setting up a dns Just seen you did try that dns

yes i already tried ALOT of things with the router like removing all security opening every port 1 by 1 that bungie and d2 use,, switched dns on console than directly on routeur to use 1.1.1.1 or 8.8.8.8 long time ago i also downloaded an app on PC to scan and evaluate my best dns options and for both location it was always my provider dns over evrything google cloudfare etc ironically in terms of numbers the bad connection have a better download/upload but a less good ping that still good its arround 20-30 but the other connection that load d2 directly have a ping of 3-7

Ya call the provider