Wow , so i’m not the only one experiencing this… Am in Singapore, mine has all the above mentioned plus random dc during wvw. It has always been smooth pings past few months with occasion lag but recently after patch, once i engage in combat my toon and enemy seems to be displaced all over (felt like during stress test beta).
It scares me since Anet responses above have all been “pls check your isp”, it sounds like this problem is something out of their radar