Well, you did post in wrong forum. Tech support forum is here. Even in there, they don’t always reply. Guessing in forum they choose to reply based on uniqueness of topic, since there’s already a blue reply on lag. Contact Blizz support if no response.
I’m 3000 miles from server, and get 140 to 230 ish ms. Not good, but within tolerable amount. Yet I don’t experience any problem in gameplay. As far as I perceive, I get instant casts, etc., all fire off imediately. I guess I am at a potential disadvantage in pvp combat, but playable for sure. But some complain of several second delays. A few complain in zone chat, while me and others don’t get the same lag.
Why would some experience seconds of lag problems, and others not, in same zone at same time?
And have they gone through the tech support process. Important to eliminate common connection issues, otherwise we can’t say it’s a Blizz issue for every lagger.