I have the same problem since the last Gw2 update, initially thought it was a service provider problem but after checking (winMTR, speedtest, port blocking on the router) everything is fine other games (mmo, online) are working fine this morning doing the Drizzlewood map , I had terrible skilllags (30-2mins), I went back to the pvp lobby the game seemed to be working well but when I joined the pvp match the skill lags came back the whole match I was standing still when my team was losing ..
best regards V