Hello.
I just wanted to confirm that over the last few weeks, we’ve made a number of changes to potentially address reported lag issues with Oceanic realms. Those changes and updates to the game service are now implemented.
As a reminder, if you experience lag issues in WoW, we suggest you check out our Common Connection and Latency Issues thread, and follow the instructions and advice therein. Blizzard Customer Support also has an updated World of Warcraft Connection Troubleshooting Resources article, which may be of help.