Nostalrius Begins - Quality wow vanilla realm (1.12)

Hi, I wrote here last day, I said I have a insane big lags and WoW is crashing after some secs, so I tried play on another Vanilla server and on that server I didnt get any lags or another issues. Interesting is, I have this problem only on PvP Nos realm, PvE Nos realm works well. So, can anyone help me how to fix these lags? It makes me really mad.

EDIT: Well, Im getting lags on 2 from 3 chars on PvP server. Idk whats going on. All of 3 chars are in highly frequented zone.